Methuup da Funky One, a member of NPT has created a custom in an way that I forgot about:
- print the blank Grumm template
- print a pattern on the other side of the paper
- and build your one-of-a-kind Grumm
So here the example of Methuup:
Tips from Methuup himself:
Use Google and search for images with “Op-art” or “Optical-art”
I’ve done this also, but by printing the blank Grumm template on a comic or stationary paper.
The only sad thing is that there are no templates to download.