Ok, ok!

I give up. Here are thr step by step instructions (gimp, of course):

1) Create a new blank image.
2) Using the attached brush, scale it to the size you want with the brush scale slider. Set the spacing up to 100% or so. Check jitter and dial it up.
3) Scribble madly all over the image until it is completely filled.
4) Offset the image by 50% X and Y.
5) Scrible to cover and ugly seams.
6) Offset one moe time and touch up.

See? Not hard at all! The clever bit was making the brush

-Rob A>