I've got the 23 CD Art Explosion set (Platinum) -- plus other stuff I've accumulated, both in e-form and copyright-free images in Dover books. Dover, by the way, has most of their stuff now on CD, so you buy the book AND get the high res electronic files. (Mine are from before that convenience, so I now scan them to use them whereas previously I statted them to use in a paste-up -- ain't computers grand?)

Linn