How do I imagine this?
A flag can consist of several parts, bars, frames, backgrounds, symbols, symbol sizes, symbol layouts, and so on.
Because there are tasks to be done, areas to be discovered, recipe, boss killing, etc.
For this reason, you could get the details of flagging bonuses.
They could be varied for everyone, so it could be very unique.
These colors could be painted the same way as with the actual paints.