I used the iPhoneshop to extract the files from the artwork folder then jus changed color ....mine glow red when things are highlighted like speakerphone..... for a winterboard theme these images would need to be in whatever.theme/Folders/MobilePhone.app/ inside your stash....
The names of the files are sixsqbutton_1 images 1-6.... 6 images to make up the one pad and then for highlighted the names are sixsqbuttonsel_1...images 1-6 also...
I've packed my images in this rar file you can download and edit them yourself if you like....
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Press Thanks if this helped!!