These are my own tutorials; I'll try not to re-invent the wheel here, but rather expand on material that may not be adequately covered by other tutorials. Links to other tutorials can be found here.
This isn't a real tutorial yet, just some Unrealscript from the ObjectPath class. Reading the documentation will give you a good idea of what is going on with your Pathpoints.
Creating Seamless Textures
Techniques for taking any (reasonable) image and making it tile seamlessly. I used Paint Shop Pro but the general techniques will work with any graphics program.