HUD Machine White for Windows 8.1

Uxstyle, Theme Signature Bypass and UltraUxThemePatcher v3.1.0
UxStyle is a bit of software that relaxes Windows theme signature requirements to enable third-party customization. Specifically, UxStyle consists of a tiny system service and a kernel driver that are loaded into memory where they hang out until reboot. No file system changes are made. (First introduced on March 19, 2009.) UxStyle was recently rebranded to UxStyle Community Edition and published to GitHub under the GPL license.

UxTheme service hook - Visual Theme Signature Bypass

UltraUXThemePatcher modifies your system files so that 3. party themes can be used. The program backs up the original system files and all changes can be undone by uninstalling if you have issues. UltraUXThemePatcher is available for Windows XP to Windows 10 RTM and Anniversary Update 1607 for 32bit and 64bit version. Note: This application makes changes to your system files, this can lead to unexpected problems or total breakdown of Windows!

ONE (OldNewExplorer)
OldNewExplorer is the Windows 10 (and Windows 8.1, and 8) shell extension / tweaker which can undo "improvements" to file browsing made in newer Windows versions. Everything is optional for your liking.

• Restore libraries / remove folders - Remove all those folders which were unoptionally added into Windows 8.1 This PC folder and put the libraries back to their place, without registry hacking / breaking apps.
• Restore command bar / remove Ribbon - Because some people consider it an abomination.
• Restore details pane at bottom - Same reason; reclaim useful horizontal space.

StartIsBack+ for Windows 8.1
What's cool in StartIsBack+? Start menu:

• Start menu has been rebuilt from ground up. Lot of Windows 7 menu bugs were fixed
• StartIsBack+ provides start button for each taskbar

Aero Glass for Win8.1+
Experience native look of Aero Glass interface on Windows 8.x+

• This utility returns the complete glass effect into windows frames.
• Apply glass look to windows borders
• Fully native including MSStyle themes and DWM API compatibility

Winaero Tweaker
After years of development, Winaero Tweaker is an all-in-one application which will include most options available in the free Winaero apps and extend it as much as possible. It is a universal tweaker software which supports Windows 7, Windows 8, Windows 8.1 and Windows 10.

• Create a Restore Point
• Install Fonts included in the "Extras" folder
• Apply System Metrics included in the "Extras" folder and logout or reboot
• Copy a Start Orb from the "Theme" folder to a new location, rename it if it's 6801, 6805, or 6809, open the StartIsBack+ configuration, click Add... select the Start Orb and Start Menu and click Apply.
• If it's not a visible option to select the themed start menu, apply your custom theme first!
• Install an iPack of your choice to change the system icons (check the Theme Extras section above for a link to the icons in the preview)!