How to add flags as background color

Hi all! Been fiddling around with the tool for some days now, mostly learning from youtube and stuff. I have currently some leds (virtual ones, not real) showing the flags, but I would like to free up some space in my screen and make the background of my dashboard change color depending on the flag. Is that possible? I tried playing with the layers, and shapes, but I cannot figure it out, any help or suggestions are more than welcome! 

Thanks a lot.