A fairly common error on private property in Hawai`i - can't call it a variant, because blue isn't for STOP signs in any color scheme - here caught in a parking lot in O`ahu off of Kamehameha Highway (CR 830).
Big Island (Hawai`i)
~ HI 11
~ HI 19
~ HI 130
~ CR 137
~ HI 200
~ HI 240