To be honest, I had quite a similar idea some time ago however feared no one would participate, seeing this really made me happy. That being said, I would love to be part of this.
I am ok with making themed icons, however, more intriguing for me would be your second idea - redrawing icons, for example, every week someone from our community draws x amount icons and we redraw it only in our own style. it would be like some sort of friendly competition, heck maybe even evolves for a good set for market! 🙂