Not all of them are tileable immediately(ie you'll see a seam at the repeats) but its usually fairly easy to fix in photoshop. Ask if you havnt done or seen it done before.
Also if you need help with combining it with procedural 'noise' so it isnt too obviously repetitive.

"I paint that which comes from the imagination or from dreams, or from an unconscious drive. I photograph the things that I do not wish to paint, the things which already have an existence."
Man Ray, modernist painter
http://artpearl.redbubble.com/