I want to make a set of images of letters and numbers, in different colors. Specifically I'm working on a children's game, and want a 100x100 px image of each alphabet (English) letter and number. Ideally, I'd like variations of each image in a few colors, too.
I know I can manually create each one in GIMP, or maybe even script something out (not fully sure on how that would work yet), but is there something out there that would already generate what I want or more easily help me do the work?
edit: To clarify, I think I'm looking for .png images as the final output. Web-based or GUI or CLI, it doesn't matter. I'm running Linux, but have access to Windows machines; I guess if it's OSX only then it's out.
For instance, if I'm walking through doing it manually, I'm going to take GIMP and create a new 100x100 image, then place a block letter "A" in the image and fill it with a color blue. Then I'll export to something like "a_blue.png". And then repeat, "b_blue.png", "c_blue.png", etc. I'm looking for anything that might make this process easier.