Free stock photography can great great for low-budget or…no-budget projects.  In a lot of cases you get what you pay for, but there’s some really nice shots hidden in there too.  Some resources that I like to use are:

http://sxc.hu/
http://www.dreamstime.com/
http://www.freestockphotos.biz/
http://www.rgbstock.com/
http://pixabay.com/

I contribute to stock exchange myself. Also, if you’re looking for textures you’ll have a much easier time finding some free resources.  There’s a lot of different texture websites out there, but my favorite so far is:

http://www.cgtextures.com/

A few more that have some restrictions:

http://www.freedigitalphotos.net
You can only get very tiny photos here

 

No longer free u.u

http://www.stockfreeimages.com/
They only allow you to download one photo for free