I have used WindowBlinds for over 2 years with no problems. I run Spyware and Virus scans almost daily with nothing to report. As for being free it is but you can only download so much from wincustomize before you have to get a subscription to download more. It is something like 50mb. I actually use Object Desktop which includes Icons, WindowBlinds, among others. I also have Cursor XP and such. I have gotten XP to look almost exactly like Vista or one of my old themes is the Matrix. It is very versitile.
I do not accept support questions via EMail, PM, IM or my G+ page!
Phone: LG Optimus G Pro
Running: Stock JB from LG with Nova Launcher