I used Tim Holtz Alcohol Inks for the background and a stamp from The Enchanted Gallery. These stamps are made to fit on a domino, which is approx 1" x 2". They come in sheets so you have a variety of stamps to choose from. She also has great tutorials on using different mediums for coloring your stamped domino.
I accented her necklace with a 14K gold marker. Doesn't show well in the photograph though.