Suggestion: Resourcepacks.

[ghost]

I'm unaware of this is even possible or not, I am just a lowly artist.
The suggestion:
Resourcepacks having the ability to change the colours of the default game's lights. (Or mod's, depends on how the feature is implemented, if even at all.)

[unascribed]

Albedo is not currently very good at static lights, like lamps and such from vanilla. This is likely to change, but at the moment this isn't really possible.

[falkreon]

I can see adding luma maps to restrict the shape of a dynamic light (e.g. spiky fringes or glowing magical tracery). It'd just be enabling texture2d and doing a color multiply to subtract from the combined effect. But, it would also require computing light UVs based on distance from source, so I'm not sure how feasible this is.

Edit - the shader just does a 3d distance function, which is perfect. The texture can go in as a flat projection extruded along the Y axis (and still attenuated by distance). The only limitation is that the texture would have to be bound, and I don't know how many texture units we're using. Probably not worth using an extra texunit.