Call ’em what you like: Hama, Perler, fuse, melty. These little plastic beads are weird, but I dig them. I like how traditional cross-stitch patterns translate perfectly to melty-bead peg boards.
I sketched a vaguely Scandinavian pattern on graph paper, and then tried it out with different color schemes of melty beads. The plastic squares turned out to be a good size for coasters, and they have a satisfying chunky density to them.