There's actually a hack that uses the name Pokemon Red DX, it builds off the full-color hacks and adds new features and Pokemon: https://www.pokecommunity.com/showthread.php?t=360339
Pokemon Red++ also uses the full-color hacks as a base, though AFAIK it doesn't add any new Pokemon: https://hax.iimarckus.org/topic/4670/
(I hope the mods don't mind me linking to other forums, but they're the closest thing those hacks have to a home page. No ROMs, just patches and Github links)
It's a pity Yellow doesn't have a full-color hack, it's a unique beast. I hope we see one eventually.
I tried the Donkey Kong Land hack and it's good stuff, though it does not run in its current state in Goomba Color on GBA or GameYob on DS. Check it out to see if it works on your preferred setup, mGBA was working fine for me though. I like the color choices and the time attack mode and other features are icing on the cake.
Has anyone ever gotten Crazy Castle 2 DX to work? I've never been able to manage it.