If you don't understand anything feel free to ask.
If you would like me to make a tut on how to make the checkered pattern, please raise your hand, as I plan to do so.
I don't see this tut's as being for a particualr program, cause technically you could do it on either. But technically it is for Photoshop, as that is what I use. But you should still be able to do most of it on Gimp, but the direction wont be exactly the same.