There's a mod around that I downloaded that allows sims to create paintings that are different from the default game (that is, you don't get the same painting with 9 different overlays depending on the sim's traits). There
are still differences relating to traits (e.g. grumpy sims create 'depressing' paintings, computer whiz sims create 'geeky' things [relating to video games, anime etc.]).
You can also take the mod and insert your own paintings -- if you want a sim to be able to paint some of Monet's or Stubbs' work? Find an appropriately-sized version of whatever painting you want, and replace one of the paintings in the mod with it.
It's all available here with a link on how to replace paintings.
Is that kind of what you're wanting?