i dunno if you'll be getting any ideas or not but i own a 67 coupe and have a few renderings on my site in different colors with different wheels etc. (see sig) There will be more as time goes on too cause now I'm on a Trans Am kick. Also I can think of at least one 67 coupe from Popular Hot Rodding in the recent past that you could probably find on their website (it's green). Have also seen a couple earlier body coupes in their mag as well. Sorry I can't think of any 68s but since there isn't much difference from 67 and you're just looking for ideas, those should work. I guess it depends on what you're into exactly. Since you're at this website you must be interested in the pro-touring look at least a little bit or Trans Am maybe? I have a pretty cool link for Trans Am stuff
http://www.trans-amseries.com/racephotos.htm ... check that out. But if you like PT or whatever, then PHR is a good place to see what some others are doing and you'll find some 67 and 68 fastbacks to go on too.
edit: looking through pics here is of course a good idea too.