Okay, okay - this could get out of hand...
This pair were produced through Printster and they have images both sides as can be seen in the pictures.
Since I am more satisfied with this set, and these give me a Hero mug, and a Hero/Villain mug, I think maybe I need a Villain mug to complete the available options. Any hobby visitor to the Pulp Citizen's lair for gaming will be accorded all 'drinking from the mugs' opportunities!
So I just need to decide on a suitable Villain - any suggestions?