I think there is an entire forum out there that is about wildcatting cartridges just like this forum is about cast boolits.
As to an official list; the extensive reloading die chart at CH-4D is probably the closest thing your going to come to since they offer reloading dies for almost every cartridge ever made that is well known enough to have a semi-standardized name and at least a handful of people want loading dies for. Personally the only existing established wildcat cartridges I have experience with and feel are worth while are the 338-08 (now the 338 Federal since it got adopted), the 8mm-06, and the 35-30/30 all of which are excellent cast boolit cartridges. I especially like the 338-08 and I was building guns for that round long before it was adopted and became the 338 Federal.
I have yet to do up my own original wildcat though. As I posted above my best idea for a pistol cartridge is the 357-LNAM. I also wouldn't mind making a rimless 357-max from blown out and cut down 223-Rem. and chamber a nice little semi-auto carbine like the mini-14 with a 16.5" barrel for it.