Hi there!
Well... here's a couple suggestions for if you want to make textures...
Take pictures of cool things and put them in your computer, then photo edit them for your purposes.
Get a good photoediting program and make them yourself from scratch. (I recommend PhotoshopCS if you can get your hands on it, otherwise Microsoft Photodraw 2000 or Paint Shop Pro 7 (I think that's the newest one)
Good luck in your texturing and addon creation adventures! Hope this helps.
Asmo