To see these paintings in your games, first your Sims must have a lot of dough and second you must unzip the file into your Sims download folder, which is usually c:\Program Files\Maxis\The Sims\Downloads

Whitaker Watercolors

Masterpieces (Livin' Large required for most)

Odds n' Ends (Livin' Large required)
Mona Lisa Rug	Augustus Tapestry	The Persistence of Memory Rug