Recently, I made a custom glass block along with its 16 stained variants. However, I noticed that there is no obvious way to give custom stained glass blocks the ability to recolor Beacon beams like regular stained glass does.
Here's what I would like to suggest:
An option to enable Beacon beam color manipulation for a block, and a color selector via either RGB values or color hexcode for what color the Beacon's beam will change to upon interaction with the custom block.
It would be a great feature to have as part of a future update as it would give creators the ability to access another vanilla mechanic.