Using Lookup Tables for textures

I am making a map system on widget, where when the player enters the room it is registered as explored and also as current. If the player has not picked a map the rest of the rooms should not display. If the player has a map then the rooms should display without color, transparent. At the moment im thinking of doing it with each room as as its own image and it being added on the map widget when constructed, but im having an issue of how to use different colors. I dont want to have it splitted across multiple files, at least no more than 2, and thats already too much. Thats why i wanted to use color lookup tables, but all i find about LUT usage is for post process.

Please help