Well I saw a request for these sort of tatts by faerieprincess at GSC2 and I thought I would give it a go and here is the result.
They are based on Louis at Simcribbling number 7 series mid skintone and have been done for the following body types:
Maxis normal male/female - teen to elder
Athelte guy - teen to elder - required meshes
hereSlimmer bodybuilder/althete girl - teen to elder - required meshes
hereBodybuilder guy/girl - teen to elder - required meshes
hereHuge bodybuilder - teen to elder - required meshes
hereThey are shown in the pic, going from normal/fit on the left to huge bodybuilder on the right (only guys shown).

Credits:
Base skintone - Louis at
SimcribblingBase meshes - Marvine