While BotB 2.0 is still young it's the best time to dream!! :D On the old engine we had remix compos, chiptune compos, 3xThemeChip and the ohbs. While we are still struggling to get all that renovated and working we can reflect on the things we've always talked about.
duels - a one on one battle
minigames - probably already monopolized by minigame comp but maybe the communities could work together
adventure games - Adventure Game Studio is free and it would be interesting to see what teams/clans of BotBrs could come up with 1-3 months time
"text to speech" poetry slam ohcs. backing bongo tracks optional.