That’s a neat idea, but just remember the gradient has to be subtle enough not to scream “I’m a map.” You could use the top layers of your roof to create a color band that shifts from light to dark where the water sources lie, and then add a second, almost invisible band in the wall paint that highlights the best hunting spots. The trick is to use colors that only show up under certain lighting—maybe dusk or when you’re on the lookout from a distance. Keep it symmetrical so your base stays tidy, and nobody will notice that the “normal” walls actually hold your treasure map. Just don’t forget to label the colors in your inventory notes; otherwise, you’ll spend half a day chasing phantom gradients.