Dance groups are able to color their shoes on purpose. I suggest that decorators be able to recolor metal objects like light sconces at their studios to create a wider range of possible interior decor
The metal paint could be strongly or slighty absorptive of coloring (as are numerous plastics) then
reflow to a shiny appearance with a warming light or if necessary a tub of colored fluid with a warming laser plus photosensor that made sure the colorization was even
Think of all those lighting sconces that could go from light creamcheese to sky blue as a decorators preference