You seem to really like your motor's original paint, so that doesn't seem to be an option. I have used a piece of camo burlap for years, it is really inexpensive, you are talking literlly a couple of bucks. I leave it in the bottom of the boat and throw it over the motor when I get to where I am setting up. If it is windy I just drop it in the water and get it wet first, it's not going anywhere. If it is frozen I just drop it in the water and let it thaw. You can fold it or roll it up to stash it out of the way when not using it. I like simplicity in my boat, and a square of this is the easiest thing you'll find.