There are many things you want to hide in order to make your interior more aesthetically pleasing. A thermostat is one of those things you might want to hide. Good thing that isn’t hard at all. For example, you can make it looks like a sunburst mirror. Obviously you can’t put a mirror over a thermostat if you want it to still work, so this won’t be a standard sunburst mirror. It would be a sunburst thermostat!
It doesn’t really matter how you’ll make it. Any material that you could use to make a sunburst mirror would work fine.