Searching for what could make a nice little demo of Unicode in 3D, here’s what I came up with:
Cube toys to learn hiragana 
(Source code / Windows executable – rar’ed / Linux executable – tar’ed)
(Note: This looks for the Arial Unicode MS font, if it can’t find it you won’t see the hiragana)
I made it float on the Windows desktop using alpha-blending…
Then I got carried away and wanted to see how easy it would be to make something similar to Corey Tabaka’s color spheres:
(Source code / Windows executable – rar’ed / Linux executable – tar’ed)