Some did not like the skulls The team's TiP Creators offers a variation on the theme evasi0n7 dynamic Wall: evasi0n Floating 7 Dynamic Wall i4s (Only for iPhone 4s)!
You will find the logo of the latter, but on a less contrasting background, where the "7" locked in bright bubbles will float.

Once activated in WinterBoard, go into Settings > Wallpapers & Brightness > Choose one image for change the color of bubbles.

Coming soon on Cydia! Be careful... 2 versions: one special for iPhone 4s, another for all iPhone 5.