I like the idea..
Laser diode crystals could be "life stones", maybe?
What about keyboard key's representing money?
For example, 1!, 2@, 3#, 4$, 5%, 6^, 7&, 8*, 9(, 0) could represent a lower unit and 1(end), 2(down arrow), 3(page down), 4(left arrow), 5, 6(right arrow), 7(home), 8(up arrow), 9(page up), 0(Insert) could represent a higher unit.