Customizable Tumbler Tag with Symbol

I liked [xifle's original tumbler tag](http://www.thingiverse.com/thing:90964) concept - I've played around with different ways to mark glasses in the past and this seems like a great solution. But I don't have a lot of colors of filament handy. So, why not emboss a symbol of some kind onto the tags as well? With four colors and four types (three symbols + blank), you can keep track of 17 glasses, which is more than I own.

This thing gives you a few pre-made symbols (peace sign, yin-yang, and