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).
~ HI 11
~ HI 19
~ HI 130
~ CR 137
~ HI 200
~ HI 240
O`ahu
~ I-H1
~ I-H201 (former HI 78)
~ I-H2
~ I-H3
~ HI 61
~ HI 72
~ HI 80
~ HI 83
~ HI 92
~ HI 99
~ HI 930 and former CR 803
~ HI 30
~ HI 31
~ CR 31
~ HI 32 and CR 320
~ HI 36 and 360
~ HI 37
~ HI 378
~ HI 380
Kaua`i
~ HI 50
~ HI 51
~ HI 56
~ CR 520
~ CR 530
~ HI 541
~ HI 560
~ HI 570