After playing the excellent F Zero X hi-res, I would like to see more car racing games retextured, such as Rush 2-Extreme Racing USA and Beetle Adventure Racing.
Both fun arcade racers, they suffer from ordinary graphics which could really be improved. In particular, Beetle Adventure Racing has some of the most insane tracks, not to mention one of the fastest racers I've played since F Zero X.
Incidently Rice beta 6.1.1 beta 10 is the only plugin, apart from Jabo 1.5 (minus FBE), that emulates it perfectly on 1964 0.85 (I used the Mupen RSP config used for Banjo Tooie cos Rice crashes alot on 0.99). Well, near perfect. The sound is still atrocious. Dunno if Beetle RA plays any better on 1.7 though...