I made this as a practice sculpt in 3dCoat. I had so much fun that I made several variants.
The print was done in clear PLA (what the machine was loaded with) and painted with rustoleum red primer and black acrylic paint. The model is a solid so if you want to make a hollow mug you must print with zero infill and zero top layers.
We talked about this thing and a whole lot more about 3d printing on the 3D Printing Today podcast available on iTunes, Stitcher radio or direct from the source at http://threedprintingtoday.libsyn.com/
I uploaded a hollow version which you can print with infill and top layers.