That second one that you want seems to be done on Mac OS X via geektool so I'd say it's definately doable. Not terribly difficult even, though it will be slightly time consuming to set up as you will have to have one or more scripts in each square.
First you would create the colored tiles, which to me could be done one of two ways. In Photoshop just create a cool background that looks just like that one you wanted, its really just colored arranged blocks (of course the downside of this is you can't go changing wallpapers all the time as the squares would be the wallpaper). So alternatively and a slightly better idea would be to use geektool to create colored blank boxes (by either displaying colored image files or by creating an empty shell command and changing its background to a solid color thereby replicating the blocks) and align them how you like on your desktop.
Once you have the background blocks sorted you would create a bunch of geektool scripts and then position them in the way that replicates that Windows setup. So say create one for CPU info and throw it in the top left one, create a RAM info one to put in the block below that, grab an iTunes script and throw it in the next block and so on.
So yes it is doable but with a bit of effort.
thank you!!! ill have to spend a weekend when im not doing anything.