ref: Mixed shape stone wall - seamless texture by Strapaca on DeviantArt
Just an excuse to play with SG again; getting harder and harder to play when my 2 jobs gets in the way. lol
Anyway, I did do some Resynthesizer/G’MIC tricks for resizing. The original also has transparent background by the way (have to retrieve that from link). 
https://www.flickr.com/photos/34520999@N05/46915586494/sizes/o/
