First and foremost: This is not a new idea. Others have made wallpaper before purposely put into a grid-like fashion in this manner.
Why would you use wallpaper like this? Simply put, it’s easier to organize your stuff with it. If you’re the type who has a ton of icons on your desktop, you will find these wallpapers very handy to use.
Each wallpaper here can be clicked on to view full size so you can try it out.
To note: If you’re decent (or even semi-decent) with a graphics editing program, anyone can make these.

Do you REALLY consider this a good tip? People need help with real computer problems, and you’re handing us wallpaper with pretty colored squares. I keep a ton of icons on my desktop – all active projects – but I don’t need a grid to find them. How about a service list of regsrvr32 tricks? There are tons of things to be accomplished that way.
Yes I REALLY consider this a good tip because it’s actually useful.
And I REALLY think it’s a REALLY bad idea to have people messing around with the system registry. Those “tricks” you mention is a fast track to permanently damaging the registry and causing your entire Windows OS installation to fail, so I REALLY think that’s a REALLY bad idea.
Have a nice day.