This Mod adds a single Block: the Rainbow Lamp. It changes color dependent on its Redstone input, what makes it easy to display 16 states in a single Block. You can also right-click the Rainbow Lamp (while not sneaking) to cycle through all colors, if it isn't powered. Like the Vanilla Redstone Lamp, it also emits light unless it is in its black state.
Especially the right-click feature can certainly be used for decoration, but the Rainbow Lamp might also be interesting for Redstoners - think of a start signal for a racetrack or a working color display ...
The recipe for the Rainbow Lamp:
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