I bought a blank munny months and months ago whilst in Birmingham, and ever since it has sat in it's box on my shelf, gathering dust! But I have got some time off from work, so I finally took the plunge and customised it! It was done nearly all in freehand (which is a bit of a challenge for me as I always draw things out first) and was inspired by tattoos and day of the dead sugar skulls.
I did this in Muji Paint markers, they worked fairly well, though some of the light colours didn't go on very well. I will definitely be having another go, but maybe with Posca pens or acrylic paint.