BlueBoard (free) is a neat customization tweak that makes your device’s keyboard keys blue system-wide. The tweak was developed by xTheMaster3x (@xTM3x) and can be installed in Cydia’s BigBoss repo free of charge.
Once installed, Blue Board can be activated via the toggle switch within the tweak’s settings panel (below) and a subsequent respring. Developer xTheMaster3x indicated he has big plans for BlueBoard in the near future:
“I’ve gotten many requests about other colors, but I’m not sure how to do that just yet…I am looking at the possibility of it” “For now it’s called BlueBoard for a reason”
BlueBoard was created by changing some of the code within iOS UIKit that makes the ‘double tapped’ shift key turn blue.
BlueBoard (0.0.1-24) Requires iOS 7