I've been taking photos at home toward a personal project like this for over a decade and have long wanted to get others to do the same. It really draws attention to all the life we live with on a normal basis. The rules are simple:

(1) must be within the bounds of what you call home (except I include birds photographed from my home over neighboring properties for view-angle purposes), and

(2) must be growing / reproducing naturally (exclude ornamental plants, pets, and such).

Have fun!