The Windows Registry is a powerful but confusing component of the Windows operating system. In earlier editions of Windows, editing the Registry was fraught with peril; if the user edited it with the wrong tool or altered a critical key, the result could be an inoperable Windows installation. Windows 7, however, is far more forgiving than its predecessors when it comes to modifying the Registry, if you use the built-in Windows 7 Registry Editor (Regedit).

The Windows 7 Registry is a massive database of settings and configuration data for the operating system and for all of the applications and drivers installed on your PC. When you tweak the Registry, you edit (or create) database entries to customize how your OS works. Before making any changes to the Windows Registry, you should be sure to back up your important data, as missteps in the Registry could impair your PC or even render it inoperable. That said, if you stick to modifying the appropriate entries--or keys--there's little to worry about.

PC World has the details HERE!

Now, just so you know if you screw it up here.. it's REALLY screwed up! Backup!

The Windows Registry is a powerful but confusing component of the Windows operating system. In earlier editions of Windows, editing the Registry was fraught with peril; if the user edited it with the wrong tool or altered a critical key, the result could be an inoperable Windows installation. Windows 7, however, is far more forgiving than its predecessors when it comes to modifying the Registry, if you use the built-in Windows 7 Registry Editor (Regedit).

The Windows 7 Registry is a massive database of settings and configuration data for the operating system and for all of the applications and drivers installed on your PC. When you tweak the Registry, you edit (or create) database entries to customize how your OS works. Before making any changes to the Windows Registry, you should be sure to back up your important data, as missteps in the Registry could impair your PC or even render it inoperable. That said, if you stick to modifying the appropriate entries--or keys--there's little to worry about.

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Microsoft has a stunning display of themes one can download for free and this page shows what Planet Earth thinks are the most popular MS has on display.

So, here ya go...

Dark Skies theme - Twisting tree limbs are silhouetted against billowing clouds, fences stretch to dark horizons, and flocks of birds burst forth across the sky, seeming to portend doom. Also, there are cows. It's a gothic world of mystery and foreboding in this free theme for Windows 7, featuring photos by Tracy Hymas.

Dreamgarden theme - Lose yourself in a dream world of flowers and leaves: This free Windows 7 theme of photos by Russian photographer Christina Manchenko will illuminate your desktop with vivid colors and delicate details.

Rainbows theme - Legend promises gold at the end of the rainbow, but in our free Windows 7 theme the prize is the rainbow itself. Bring the fleeting magic of rainbows to your desktop and enjoy shimmering hues and otherworldly arrays of color poised over stunning landscapes from around the world.

Magic Landscapes theme - Adorn your desktop with some of the most beautiful landscapes on Earth, as seen through the lens of photographer Michael Breitung. Waterfalls, mountains, fields, and coasts fill this free Windows 7 theme.

Moonlight theme - Ooh, ooh, ooh, what a little moonlight can do to you! Yes, but how about a LOT of moonlight? This free theme for Windows 7 features brilliant full moons, hazy winter moons, and moons rising dramatically over castles, mountains, cityscapes, and rock formations. Not recommended for werewolves.

Microsoft has, like...5 more rows of terrific themes plus pages and pages of stunning backgrounds and wallpaper.

God... you can go nuts here... all for FREE!

Hey, need a change from your old dreary desktop? Check this out.

Microsoft Windows 7 Theme: Classic American Road Trip

Microsoft Windows 7 Theme: Porsche

Microsoft Windows 7 Theme: Ferrari

Microsoft Windows 7 Theme: Windows Live Clouds

Microsoft Windows 7 Theme: Roses

Microsoft Windows 7 Theme: Chickens Can't Fly

Microsoft Windows 7 Theme: Magic Landscapes

Microsoft Windows 7 Theme: Dark Skies

Microsoft Windows 7 Theme: Bullet Asylum

Microsoft Windows 7 Theme: Animal Affection