AeroBlend is a popular desktop enhancing freeware designed to automatically change the color of window, taskbar matching the current, different surrounding environment - wallpaper or active application icon\contents. Easy to use and very cool!
Power Dimmer is a ultra-ultra-small (less than 3 kb) screen saver which enables your screen to become black gradually, it shortens the time of computer coming into screen saving status, in other words, a PC will begin to fade out immediately when it is idle, this is a very good effect which the Windows default screen saver can't give us.
TransOther can make transparent to all but the active window, that is, it can let the current window highlight, but make other windows more transparent and more dim. So you can concentrate on the current working window, and won't be influenced by other Windows.
Sometimes you may not like to have the taskbar block your lovely wallpaper, or need the whole desktop to put icons or other gadgets. One solution is to check the "Auto-hide the taskbar" option in the Taskbar Properties (right-click taskbar), in this case the taskbar will not display until you move your mouse to the bottom.
If you are using an older version Windows operation system (not Windows Vista or higher), maybe you want to let your window has a transparent effect like (or even more powerful than) Vista or Win7? With this small tool Vitrite, you can make any window has 9 levels of transparency adjustment.