Two Game Boy Advanced games that I have put into DS cases.Tactics Ogre: The Knights of Lodis was a great game that is pretty rare these days. A new Tactics remake has come out recently on the PSP. The second title is Super Robot Taisen: Original Generation. Only three Super Robot Wars games have made it to the US, and anyone who is a fan of Anime and mech-mashups would enjoy this RPG. Both were released by Atlus, one of my favorite game companies.
The covers were printed at a local print shop and cut there as well. The look great on the shelf next to the other DS titles (and hold up better than those lousy GBA cardboard boxes). I will be showing off more of these in the near future.
Jason at the EMUReview has some videos about putting your GBA games into DS cases.