Alien Encounter Green Windows Icons Pack Works on Windows 8 x32/x64 and Windows 7 x32/x64, it is completely safe to apply and you can restore your previous icons easily.
Encounter Green Windows Icon Pack uses 7tsp free app that allows you to customize Windows in a simple way, and it is also create system restore point to be safe.
you must download 7tsp from here first to use this icon pack.