From Starwars.com:

"Collectors and fans alike have a chance to own one-of-a-kind Star Wars art pieces while giving to a good cause with The Empire Muggs Back. Lucasfilm asked artists, comic book creators, toy designers, and celebrity fans armed with markers, paint brushes and glue guns to transform blank Mighty Muggs (donated by Hasbro) into custom Star Wars art which will be auctioned by The Make-A-Wish Foundation.

Starwars.com chats with artist Cat Staggs about her process for turning a blank Hasbro Mighty Mugg into Thrawn."

Click here for the rest of the article.

The final Empire Mighty Muggs art pieces can be found here.