I have 5 png image files, each is a different color of a simple balloon map marker. I'd like be able to dynamically insert/edit/add a number to each. The numbers could be from 1 to 250. So, with 5 colors, I would need 1250 png file to cover all combinations of colors/numbers. I'd like to use the 5 colored png files, and then dynamically insert a number, centered within the ballon.