I'm not sure if I'll manage to do it, but I would love to do a de-make of old WoD's Changeling: the Dreaming. That game was very formative for me as a teen and it's one of the most tone-rich games in the setting, but its rules are often a mess. Maybe I'd try something like a bidimensional Lasers & Feelings but with two axis: Human-Fae and Seelie-Unseelie... Man, that could actually rule. I hope I'll find the time to make it.