If you haven't already, check the stuff out for slim bodybuilder at Sim-antics:

http://dlmulsowssim-antics.com/

(Free reg. req.)

See also Cyclonesue's set.

At T$R: http://www.thesimsresource.com/artists/Cyclonesue/downloads/details/category/sims2-sets-objects/title/Glass%20Block%20Set/id/493857/

Also at the booty (glassblockset.rar): http://ls.paysites.mustbedestroyed.org/booty/ts2/tsr/cyclonesue/object_sets/
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Strictly as an aside, but as you seem to like that type of style of hair, you might check out the offerings here as well for some similar or reminiscent styles:

http://dsb.g.ribbon.to/downloads/hair/hair.html
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Yes, it matters.

What differs for any particular lot is the degree to which it matters.

You might end up with a lot in which some elements are missing (for example, carpets or tile).
You might end up with a lot in which some elements (for example, windows) show up as a Maxis default or otherwise incorrectly.
You might end up with a lot in which some elements are flashing blue (or else show up as strings of text and numerals due to a missing mesh).
You might end up with a lot which either will not load or which will crash your game.
You might end up with a lot which contains game-wide default replacements (and thus will change other lots you already have).

It all depends on what EP- or SP-dependent elements are included with the lot.

Using Clean Installer to install lots is highly recommended, as it gives you the option of selecting what you actually want to install (the barebones lot/house and/or any other particular elements which may be included with it) as well as the option to not install any hacks which might (advertantly or inadvertantly) be included with the lot (and any of which might negatively impact your game). It is not uncommon for lot creators to create a house/lot in their game set-up which includes hacks (either minimal or global hacks) or hacked objects and either be unaware of that or fail to provide that information in their descriptions.

Note that Clean Installer will not give you the 'missing EPs/SPs' warning, but on the other hand will allow you to check many items individually and have the install process ignore additional associated content which may be EP- or SP-dependent.

Info/download of Clean Installer here:

http://sims2pack.modthesims2.com/index.php?page=4

Eye of the beholder and all that, but you also may find of use some items here:

http://sixsixsims.net/downloads.php

http://www.sims2cri.com/eng_abbigliamento.php

http://www.simchic.com/

http://www.parsimonious.org/fashion2/themes/theme_1217688828.shtml
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Just gonna throw out a raft of links to some off-the-beaten-track sites with a variety of houses, lots and styles. Many, but not all, are non-English, but still easy enough to navigate and download from.

In some cases, you may have to scroll down or to pages further in from page 1 of the Houses category to get to those made without newer EPs.

http://www.webalice.it/mikebur50/index.html

http://www.acasadossims.com.br/home.aspx

http://www.xn--hg-gkaw.de/houses.htm

http://www.styling-home.de.vu/

http://lsre.jillyann.com/

http://www.loverat.net/sims2resiuf.htm

http://catalog01.ifdef.jp/

http://organza.sims2.free.fr/batiments.htm

http://teharimmosims.free.fr/index.html

(Houses at that last link listed inder Les Maisons -- click Télécharger for free download of any particular housing lot)

Presume you mean the rug under the bed.

Hard to tell, but a good source for rugs like that (you may at least find one similar there) is Avalon Sims:

http://www.jaue.com/avalon/menu.htm

Lots of rugs scattered inside the Decor section, but also many included in other sections as well.

Sounds like Squinge's mod.

There are various cake/grow-up/young adult/no college versions, depending on which EPs you may have installed, in Squinge's section:

http://www.insimenator.org/index.php?PHPSESSID=e1589fbd7a56bf00a7ac038e3fbe8b3c&board=152.0
.

A few, also, by Windkeeper at T$R:

http://www.thesimsresource.com/downloads/details/category/sims2-sets-objects/title/Mailbox%20Recolors/id/289840/

http://www.thesimsresource.com/downloads/details/category/sims2-sets-objects/title/Mailbox%20Cover/id/182049/

Both also available at the booty (mailbox_recolors.rar and mailbox_cover.rar):

http://ls.paysites.mustbedestroyed.org/booty/ts2/tsr/windkeeper/objects/

Kavar moved over to Gay Sims Club 2 (18+ site, so no link shall be provided here). Presumably that would be where the skintones are now.

As for the hair, although the pix at the following linked page aren't available, the downloads by color should still be working:

http://alkaloidlabs.blogspot.com/2008/05/9-all-ages-buzz-cuts-for-males.html
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Pulled quote:

If you have the Seasons Expansion:
You must use Numenor's BaseGameStarter or the Any Game Starter to create your custom CAS lot without Seasons!! Custom CAS lots created in Seasons will cause all sims made within your new CAS screen to freeze to death. Unless you like simsicles, you'll need to use the BaseGameStarter.

Info from the CAS tutorial here (includes links to needed items):

http://www.modthesims.info/showthread.php?t=180469

Same query from you was answered in July:

http://www.insimenator.org/index.php?PHPSESSID=86701bea8a09b75c71d2cdc324690a6d&topic=106573.msg1553127#msg1553127

Also see here (search is your friend):

http://www.insimenator.org/index.php?PHPSESSID=70c58268303b0b1aa2a22d1efe670075&topic=107402.msg1564676#msg1564676
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If it is olemantiker's helmets, they are here (semi-adult site, but this link is not to adult content):

http://beosboxboy.blogspot.com/2008/01/olemantiker-sims-2306-ad-tech-units.html

And also a purple recolor included here:

http://www.insimenator.org/index.php?PHPSESSID=5a3dce8543f204ce523f8b10682eed6f&topic=75991.msg1168726#msg1168726
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Have had no problems in my own game doing this with the Last Name Copier:

http://www.modthesims.info/download.php?t=289073

Off the top of the head, don't recall if it will automatically work with infants without making them selectable first  (which can be dangerous for the game) -- but regardless, will work for any Sim from toddlers on up.

Should be compatible with AL, which somewhat altered the naming internal bits of the game (the post linked above is mute on that), but no guarantees on that.

Should the painting object itself not fit in with your decor, just delete it after making the name change (the new name will still continue to be in effect).