We knew we didn't want to paint it, but I didn't want to do anything to make it difficult to access. We settled on creating a simple frame with a fabric overlay to help camouflage it with the wall. We knew it wouldn't be perfect, but the goal was a quick and easy solution to make it so it wasn't a massive eyesore when you walk in the room.
First we used 1x2 furring strips, which are super cheap, to create a frame. We just joined them using a nail gun and a few dabs of glue. We made the frame just big enough to sit over the fuse box flush with the wall.