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To make these I used Photoshop and went to save for web. From there I changed it to a gif and changed the colors. I wasn't able to change them into a completely different color (like from red to blue) unless I saved what I made, reopened it, and made changes via image>mode or image>adjustments. I then saved the finished result as a png. I'm sure there's an easier way to do this, but I'll have to play around with it some more.
