I want to scan a texture (non-seamless surface)and then turn it into a seamless texture for use in Bryce. Does anyone know of a program (or an algorhythm) that will do this?

The only process that I've been able to really use so far is to load it into Photoshop and play around with the textures in there. But it requires a bit of blurring and editing to get it really seamless. There are a number of tutorials out there though for doing this. If you need links, I can try to locate a few for you. Really depends on if you have Photoshop.

The doctor says I have way too much blood in my caffeine system.

I agree with RimRunner, i myself will scan anything but i will always load it up in PhotoPaint and play with it. And yes try to look for some totrials over the net.

Kai's powertools (commercial product) has a seamless welder and so forth to help. Or the filter Terrazzo for pshop. Personally I just use the offset filter in pshop and lots of cloning. :)