Dan Goodsell’s blog has a great set of 1970s Hanna-Barbera promo art today. Most of this stuff is familiar but some of it is totally obscure to me. Robonic Stooges? What? I did have a Quick Draw McGraw card game that I loved.
The page with the weirdest stuff is in this fairly large scan he put on Flickr. (799 x 1042 jpg).