I've been playing with transfers and found these printable decal sheets from Lazertran.
All you do is inkjet print your image, wait 30 minutes, soak it till the backing comes off and then place it right on the domino. The glue already on the decal was enough to make it stick.
I have put the image on the dot side and really love the way you can see the eyes through the image.
:o)
