Very rarely you'll find a rom that's not compatible with the rgb nes ppu chip. Luckily it's easy to hack a rom to make it work with the rgb chip. I havn't bothered hacking every game out there, but I found a couple that I enjoy so I hacked them to work with the rgb chip. Here's the current list:
Rockman 4 Minus Infinity:
This is by far the best romhack I've ever played. This is a total conversion of rockman 4 that basically feels like a completely new and original rockman game. Everyone should play this. I'm fairly certain this build I'm posting is fully rgb compatible but if you find any spots where parts or all of the screen go solid white let me know so I can fix it.
Mario Adventure Hack:
Mario adventure is a wonderful hack but I had to change some of the pallette data in the game to not get a black screen. This patch also includes a fix that lets it run on the famicom n8 flashcart.
Just Breed converted into English and hacked to run on a rgb ppu:
Just breed is a really fun game. When I bought the cart and plugged it into my rgb system all I got was a white screen. This version of the rom has been patched with the english fanslation and it has been patched to run fine on a rgb system. Currently the powerpak doesn't support just breed, I'll ask krikzz if the upcoming famicom everdrive will support the game.
Both of these roms havn't been extensively tested so if anyone finds something that doesn't display right please let me know.
Also a huge help to the nice people on nesdev who helped me figure out how to get these roms running on a rgb system.