We have seen a new boot screen in latest leaked Windows 8 build 7989. The folks at Deviantart has now created a similar boot screen for Windows 7. The boot screen has three variants- Variant1 without ugly fish, Variant1 with ugly fish and Variant 2 without ugly fish.
Here is how you can install the boot screen in Windows 7-
■ Download latest
Boot Updater ■ Unpack files from archive
■ Open this program > Click File > Load boot skin…
■ Navigate to .bs7 file
■ Select one what You like
■ Click Apply

You can download the Windows 7 Boot Screen from
here.