Alrighty, this question comes up a LOT, so anyway, decided to make a new video on it, that is a bit more polished than my previous one. This does not count as the tutorial for the week.
Using this you can install:
Patterns in Gimp
Brushes in Gimp
Scripts / Script-FU in GImp
Plugins in Gimp
Gradients in Gimp
Themes in Gimp
and More
How to make an awesome image in Gimp. I know I said I would show you how to put someone that missed a picture into another picture, but the concept is the same. Here is then pencil I used: