So I did.
Basically you take a plain white coffee mug and draw a design using on the cup using a sharpie marker, then bake the cup in an oven for 30 minutes at 350 degrees and let cool.
Google the technique to get more detailed instructions.
I have used the cups for over a month and they are holding up quite well although some of the black has rubbed off the cup I use almost everyday.
Still a cheap and fun way to make some original mugs for yourself or a friend.