Collage Images is a flickr group that is a great collection of vintage copyright-free artwork that you can grab and use as you wish. I really hope that we can see more of this in the future. Take a few minutes and explore the collection, they have some really great and obscure images. Believe me, these images are a much better option than using clip art, and a lot cheaper than hiring a designer. —- P.S. You do have to register with the group before you can view the images.