From Pimp My Sims
TOU (Reading any creator's TOU is advised before asking anyone to modify/recolour/covert/change them in any way):
No modification or re-use (even in parts) of alpha maps, textures or bump maps
Also,
we have stated, before asking for any creator's Sims 2 content to be converted to Sims 3, permission from the original creator must be obtained (reading Stickies is good for you). In light of this, without express permission from PMS/Schnuddl to use this texture for Sims 3, this request may not be fulfilled.