Apps like Demo Mode Settings

Here are some great alternatives to Demo Mode Settings by Nightly Nexus :
Gray-Switch (Grayscale)
Gray-Switch (Grayscale)
★3.8
Pixel Tuner - SystemUI Tuner
Pixel Tuner - SystemUI Tuner
★3.8
Quick Settings app
Quick Settings app
★4.5
[Substratum] Samsung System Mo
[Substratum] Samsung System Mo
★3.5
Terminal Pro - Green CRT Theme
Terminal Pro - Green CRT Theme
★4.2
Battery Notification
Battery Notification
★3.9
Dark Void - Black Circle Icons
Dark Void - Black Circle Icons
★4.0
Baked - Dark Android Icon Pack
Baked - Dark Android Icon Pack
★4.8
Settings - Secret Settings
Settings - Secret Settings
★3.4
Battery Percentage Display
Battery Percentage Display
★3.9
Statusbar Icon Hider Customize
Statusbar Icon Hider Customize
★3.3
Material Things - Icon Pack
Material Things - Icon Pack
★4.2
Super Quick Settings Pro
Super Quick Settings Pro
★4.5
Quick Settings for Android
Quick Settings for Android
★4.7
Icon pack for Android ™
Icon pack for Android ™
★4.0
Show Battery Percentage
Show Battery Percentage
★3.9