It is SO amazingly easy to create your own tatoos you might as well give that a shot as well. Just grab a body template, throw it up in GIMP, add a layer, and paste in something you found with a Google search. Robin Sojourner has a good template, and typing in "create your own tatoo in second life" (no quotes) brings up several tutorials.
You can run through a tutorial in about 5 or 10 minutes, and you don't need to be a GIMP god to do it - just follow the tutorial instructions and load the template file, add a layer, paste in the tatoo, resize and reposition it, anchor the tatoo, export as 32 bit tga, and upload it in Second Life. If you hate GIMP, paint.net is easier to use and (probably) can load the template as well.
Seriously, its just damn easy.