Careful with this one. There are a few different License agreements on the site. Some are completely free, others....not so much. They will allow you to do what you want for personal reasons, but commercial gets sticky and different. I'm not suggesting that you don't use them. I am suggesting that you be careful and make sure to read what you agree to.
"Go ahead, make your logos in PS. We charge extra money to redraw your logo into vector art so it can be printed on promotional product. Cha CHING! " - CCericola