Here's a simple theme created using sprites from Sonic the Hedgehog 2. The color scheme of the tabs/address bar are meant to mimic the color scheme of the title card at the beginning of each act in the game. While browsing normally, you can see Sonic and Tails racing through Emerald Hill Zone. While in Incognito Mode, the duo find themselves bouncing around in Casino Night Zone. The new tab window as shown in the demo screenshot (blurred to avoid personal information) showcases an enlarged version of the title screen. I've used this theme on both a 1366 x 768 and a 1920 x 1080 monitor and it's worked just fine on each one.