I occasionally like to use photos on my blog that I haven't taken with my camera; mostly for illustrative purposes or for things like banners, themed images, or photo montages. I also do some commissioned work for friends when I get the chance...but not so much since I opened up my Etsy site.
The other cool thing you can do is submit your own photos to the site; however, I haven't done that yet. So...perhaps you should check it out if you're into design services, or if you like to have access to a nicely sized, nicely organized photo library. Or, perhaps you can take one of your favorite Flickr photos, put them on Big Stock Photo, and make a few bucks for yourself. Have fun!