Check out this handy way to transfer images from your computer into fabric using freezer paper! This would be a fantastic way to make special badges just for your units! Older girls like Pathfinders and Rangers May want to learn how to make their own!
You will have to play around a bit with the fabrics and printer you use, but she gives some fantastic advice at the beginning of the video.
I can envision younger units like Brownies and Guides personalizing these badges even further with some embroidery work (and what a great way to learn how to do some simple needle work)!