The simplest theme I could think of this time was Captain America–another Marvel comic book hero–who’s t-shirt he often sports. And since his wife (my SIL) doesn’t really care so much about themes, and had her birthday in July, I thought a little red white and blue would work well for her, too!
The method I used actually worked really well and was pretty fast to do. I used some Petal Dust (like luster dust, but not shimmery) I had on hand, mixed it with an alcohol based liquid (like vanilla, lemon, or almond extract), and then painted it on with a clean paintbrush. I used different sized bowls and a star-shaped cookie cutter to make my design, and then just painted in the colors. I used food markers to write my message on the side of the cake.
Are you ready for the big surprise?