Aero Glass is a good example of that! It's clean and attractive, while not being too distracting, especially compared to Windows XP!
That's why I have no regrets when I say I think Windows 7 is the definitive version of Windows. Except for Windows 8.1, but that's just my opinion!
8GadgetPack
1809 ONLY! Windows 10to7 Transformation Pack
StartIsBack 7+ Taskbar Tweaker
WinDynamicDesktop