A pinsider has already come up with a cool tesseract cube mod.
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"Parts needed
Golf Ball Display Case (Hobby Lobby $3)
Frosted Glass Spray (Menards or your favorite hardware store $5)
Wax Paper $2
LED Ball with spring switch (Toys R Us Rubber Ball $10)
Bracket (Right Angle Aluminum from Menards and a lot of Dremel work $6)
Note: the rubber ball contains three LED balls submerged in a "liquid". The ball has to be cut open to retrieve the three magic LED balls with motion sensitive spring switch."
more detail here of step by step of a tesseract cube
http://www.therpf.com/f9/build-tesseract-cosmic-cube-must-any-avengers-154280/
