I been trying to use truespace 3.2 and blacksmith 3d paint with little success. I would like to know if there is a way to use Adobe Photoshop CS to make the textures seamless, or if there is a plugin that would work for it. Any help would be greatly appreciated. Thanks.

Google Richard Rosenman. He offers several free plugin filters that I find extremely useful, in this case a tiler plugin. The one thing you have to make sure of is that your top and bottom and side to side match reasonably well. There are probably lots of tutorials if you google paint tileable textures, but really, it's more something that comes with practice.

What you have to watch out for are large, distinctive features in your images, which when tiled will repeat annoyingly and make it obvious that it's a tiled texture.

Thank you.

Here is a youtube video that demonstrates how to make a tileable texure in Photoshop.

http://www.youtube.com/watch?v=kjB7lYXqYFE

There is also this program called Genetica that generates tileable textures from scratch that you might find interesting.

http://www.spiralgraphics.biz/genetica.htm

There was a program a few months back that came in the 3DWorld Magazine, unfortunately right now I don't have that episode on me so I can't recall the name.  I haven't completely explored it, but it seemed to do pretty well with seamless textures.  I'll attempt to find it while I'm at work, if not I'll come back on later tonight and let you know what the name of the program is.