Allow streamers to customize the background of the reward buttons, not just the icon, and make the icon optional. Right now the reward redemption buttons look very plain and too similar to one-another because they're just solid-colored shapes with tons of blank space. I would love to use an image to cover the entire body of the reward button, not just a small icon in the center. Not only would this allow the rewards to be more visually distinct from one-another, but it could be used to make cool visuals by combining the background and icon (i.e., a reward called "Choose what OW hero I play" could have an Overwatch icon with a blurred screenshot of Hanamura as the background).