In the centre is the stamp of the Maneki Neko we bought in Kyoto -- we made a 'gilded' version using gold-colored powder. Then I used felt-tip pens to color in a framing stamp I have, in yellow, orange, red and green -- and I simply pressed that around the cat.
(As an aside, I am seriously impressed with the Staedtler felt-tip pens I use. I started with the red stars, and it took me more than five minutes to color in the whole stamp -- and still the reds came out quite well!)
I rounded it out with a birthday wish in my crappy handwriting.