Some Blue Lantern coasters, in both regular and Mini Perler beads.
On a side note, using the tape method for mini beads on the circular board is a bit of a nightmare. Unlike square boards, you can't easily predict where the beads are when poking holes. Also, good luck just using the board itself to poke the holes - you have to line it up perfectly. Instead, I had to make the holes one-by-one with a lamp focused on the piece so I could see where the beads were.