Quoted from fosaisu:
Can you post a pic of your homemade ones (and any notes you have on material used, etc.)? I've been thinking about making my own since I don't love all the yellow up on the battlefield, but don't really like the commercially available options.
I will have to take some pics, but basically I got an image off the internet that had all the target decals on it, then I colour laser printer that onto clear labels that you get from the stationary shop. Then I cut those out and stick them on aluminum tape which you can get from electronics shops. Then I put Mylar over the top. You just need a good steel ruler and Stanley knife to speed things up.