If you can afford to get object desktop it is well worth the extra cost. That is my opinion.
I don't know what the cost is since you already bought Windowblinds. I'm sure there is some kind of an upgrade.
With OD you get a bunch of other programs that change the look and feel of windows plus a few extra bonus programs like tab launchpad.
Sysmetrix is easy to change skins. Once you start the program, right click it and in the menu choose configuration. When that open there will be a list of skins you have downloaded. Choose the one you want and click apply. If you don't see the skin you want then come back here and download it