Big Windows 8 Customisation Thread: Tools, Tricks, Hacks and Help

Hey everyone! I love to customise* my machine and there is no general repository of information for customising windows 8,as far as I can tell. So how about a big thread about everything you can do to make your desktop cool, pretty or whatever you fancy..? 

• Everyone who has discovered a cool customisation hack, tool or setting, please share!
• Anyone who's got [intelligent] questions, please ask!

Let's learn from each other and get on top of how we can master the the GUI of windows 8                                       

Existing Threads:

• How to get the Start button back, (Please see separate thread)                                                                                 Win 8 Wallpapers (Please see sticky thread)       

        Other Potential Topics:

• How to Customise the Start Menu (Metro) -Really change it
• Does Stardock and similar companies make any products for Win 8?
• What other customisation tools (freeware, shareware etc) are available and what do people think of them?
• Real hacks that change the look and feel of windows 8 - Description and implementation 
• How to customise the Desktop - are Dreamscapes and moving desktops still around?
• Cool GUI features that exist in Win 8 and are new (trying to think positively...)
• How to get Aero back, and is there any point?
• Warnings - what NOT to do, or you'll break the installation....
• Help if you've messed up...
• Annoying features and how to turn them off....                                                       *duh spell-checker, this is UK spelling, and it is correct.