Mike Geoghegan recommends the mic flags from Impact PBS. This dude made his own. I decided to take his recipe and see what I could do.

His recipe calls for buying a block of styrofoam and cutting it down to a 2" cube, and then gluing a printout of your logo to it. I was at Michaels buying the styrofoam when I noticed the bin of 90% off Halloween stuff. I saw these blocks, which magically turned out to be 2" cubed already, with these little decorations glued on. I decided it would be easier to scrape off the goblins than to cut the styrofoam, plus I was just going to color it black anyway. Bonus one - the foam is not completely solid but is firmer than the styrofoam and will almost certainly wear better. Bonus two - they are marked down to $0.10 apiece.

I liked how it turned out. It isn't perfect but for less than $1 of materials and ten minutes of effort it's not too damn bad. I have several orange and green cubes, and six more of the black so I can try a few more shots at this. If you have a Michaels store nearby, it might be worth seeing if you can find one of these for a dime.