Campiglia and Wells has lots of pics, but not complete by any means.
For good eye candy, check these out:
Nevada Chip Pictures Las Vegas Casino Chips Museum - Las Vegas Casino Chips, Poker Chips, Slot Cards, Hotel Room Keys, & History
The other guide you are thinking of (the Queen mother of Vegas price guides) is the Chip Rack. Lots of values and other pertinent info, but not a pic to be found.
Hope these help. I know they have helped with my designs.
Edit: BTW, MGM Grand and the Bellagio are nice, simple chips, but I wouldn't classify them as "classic". The Grands are actually one of my favorites, but as you start poking around, particularly the first link, you'll see the older chips have very simple, almost plain, inlays. The older stuff primarily have hot-stamps. It'll be interesting to see what you come up with.