Having messed around with F-Zero 99 a little, one thing that springs to mind is that I'm a little surprised the whole "retraux" movement hasn't dabbled more with the Mode 7-style "3D" graphics seen on some SNES games and a few on other consoles here and there - it's never really been something I've considered, but I think it's almost a missed opportunity.
Giving that kind of look a modern treatment with a few changes here and there to modernise it a little seems like it'd work for a really cool visual style that there hasn't really been much of. Immediately, that one indie kart racer springs to mind as a game that does use this kind of thing, but it'd be cool to see different takes that aren't Mario Kart clones or perhaps even in the racing genre - something like a simple tank game akin to Wii Tanks feels like it could work pretty well in that sort of style!
Giving that kind of look a modern treatment with a few changes here and there to modernise it a little seems like it'd work for a really cool visual style that there hasn't really been much of. Immediately, that one indie kart racer springs to mind as a game that does use this kind of thing, but it'd be cool to see different takes that aren't Mario Kart clones or perhaps even in the racing genre - something like a simple tank game akin to Wii Tanks feels like it could work pretty well in that sort of style!