I would like to introduce Winaero Tweaker - universal tweaker software which supports Windows 7, Windows 8, Windows 8.1 and Windows 10.
There is a place for tweaks which can be added using the "Bookmark this tweak" button on the toolbar. Keep here tweaks which you will use often.
The user can view information about your PC hardware and OS. Did you know that Aero engine in Windows 7 operates with two colors simultaneously? Change window frame color and set the same color to the Start screen. Checkout "Enable Window Colorization" and "High Contrast Mode" hidden Aero settings. Change window frame and taskbar color and set the same color to the Start screen. Activate the hidden Aero Lite theme in Windows 10, Windows 8.1 and Windows 8.

There are some hidden secret options to customize the appearance and behavior of the Alt+Tab dialog.
Alt+Tab background transparency - allows you to adjust the transparency of the Alt+Tab dialog. 0 - means a completely transparent Alt+Tab dialog background. 100 - means a completely opaque Alt+Tab dialog background.

Dim Desktop - the ability to dim the Desktop wallpaper and background windows when you open the Alt+Tab dialog. 0 - means a non-dimmed Desktop when Alt+Tab is pressed. 100 - means a completely dimmed Desktop when the Alt+Tab dialog is opened.

Hide opened windows - when enabled, this feature makes Alt+Tab show on an empty Desktop with icons and not a single background window open to distract you.

Change these options and press Alt+Tab to see them in action instantly.

There are some hidden secret options to customize the appearance and behavior of the Alt+Tab dialog.You can change:
-the size of the thumbnails
-horizontal spacing between the thumbnails
-vertical spacing between the thumbnails
-top, left, right and bottom margins around the thumbnail.