Like the user interface on ICS? Stuck with a gingerbread model?
No worries, now Android devices with GB can have the feel of the ICS UI by using Holo Launcher by Mobint Software.
Like any other ICS launcher out there, this is a simple, powerful, and fast launcher with a highly customizable home screen replacement based on Android 4.0.4 ICS’ Launcher. It has a basic requirement for the Android version to be 2.2 or up and works great with battery life as well. Look below for a basic description.

Full ICS Style
ICS Icons, Folders, Outlines, Drawer Tabs, etc.

Custom Desktop Pages/Grid
Up to 9 desktop pages and 10 x 10 grid.

Custom Drawer Portrait/landscape Grid
Set different drawer grid for portrait and landscape screen.

Scrollable Dock
Up to 7 icons per page and up to 3 pages.

Infinite Scrolling
Loop through your desktop/drawer/dock continuously.

Swipe up/down on desktop to launch apps quickly.

Customizable shortcut/folder icons
Long press to edit shortcut/folder icons and labels, support ADW icon pack.

Desktop Previews
Pinch to access desktop previews.

Backup and Restore
Backup and restore your settings and shortcuts.

Other Customization Options
Keep in memory, home key action, hide apps in drawer, hide labels, etc.

While the app is still under development, you can head over to the XDA Developers thread to vote on new features and sideload the APK if you choose. Its also available in the Google Play Store.
Our rating 4/5, a lil buggy as it is still in the development stage, but we hope to see more in future. Untill then, try it out.