Finished Lego Brick USB Drive
I cut down the hollowed-out 2x4 brick so that with a 2x4 plate glued to the bottom, it would have the height of a norma brick. There is a small hole, filled with clear epoxy which lets the "busy" light shine through. The light is blue, which makes for a neat effect on the blue brick.
I decided on the two-tone scheme just to be different, and maybe to give me a fighting chance if and when this ends up in the Lego bin by mistake.