Have you tried the new two-hole SuperDuo beads? I've been trying out several design ideas with these and the two-hole twin beads, and I came up with some cute beaded beads:
This particular design requires the uniformity of the SuperDuo beads and doesn't work well with twin beads, but other than that, it offers tons of design possibilities. With a change in geometry during the beading process, it switches from a cube to an octahedron:
Pattern coming soon!