New Unearthed Arcana Sub-Classes proposed for D&D 5e. Survey is still up
Really dig the Circle of Spores concept for druids. Could use some fine tuning, but would be a fun character to play. The brute seems pretty cool too for fighters...
I also really liked the Brute, it feels like a simple Fighter sub-class that you can just take all the way to 20 compared to Champion which so often is merely dipped.