Here are 30 themes for April, if you want to give it a go. Try to take a photo a day for each theme. Sorry, I know it's now the 4th, but I'll list all 30, anyway.
Doing a photo challenge like this allows you to capture little moments in your life, instead of just the really big ones. Plus, you will start seeing your everyday life differently, and you may just see some things that you normally miss. I don't always do this everyday, but I try when I can.
I post my photos on Facebook, Pinterest, and on this blog.