A Horde symbol plus a guild icon.
"Here's what you'll need to make your own bandana," says Serthida. Pre-fab blank bandana (I purchased mine at JoAnn Fabrics) A stiff-bristled brush (but you can use an old toothbrush) Paint of some sort; in this case I'm using cheap acrylic craft paint, since I know how hard it is to wash out of clothes it accidentally ends up on Contact paper/shelf liner paper (I like to use the clear kind, but if you want some with flowers or puppies on it, more power to you.)
"I made a positive stencil of the image I wanted -- in this case, my guild's hammer. You can print out your symbol first, to make it easier; I just freehanded on some spare cardstock. Anyways, trace it onto the paper backing of the contact paper. If you're doing something that isn't symmetrical, like the Horde symbol, MAKE SURE TO TRANSFER YOUR IMAGE BACKWARDS."
"I flipped the hammer and traced it on. It's not exactly a mirror flip, but it's good enough."
"Cut it out!"
"I peeled the paper backing away from the contact paper and stuck it down onto the bandana. If you have a non-symmetrical image, this is why it was important to transfer it backwards in the earlier step, since now it's flipped the correct way."
"Make a mess! Load up your brush with your paint and flick, flick, flick! Make sure to take plenty of time and get enough paint on your project that you get a nice, sharp end product. Note that I put down something underneath my bandana to catch the splatters, since this step is pretty sloppy."
"Done! Let the paint dry and then peel off your stencil. Enjoy your new geeky clothing item!"