Thank you for this! I got around to doing it and now I have the best light switch cover a hockey fan could ask for 
I ended up doing two passes using @ovm.steve’s instructions - guessing I laid the spray paint on a little thick
Sealed with a spray polyurethane and up on the wall!
The only downside is realizing that the switch itself was installed a touch too deeply into the wall so I (almost ?) cracked the case trying to get the screws to catch.