Wonderful collection audiorep2! Gibson did offer Pelham blue and Golden Mist as custom colors during production years of the EB2 and EB2D so it's at least possible they exist. Have you ever posted on the Last Bass Outpost? If not, the folks over there would love to hear from you I'm sure, and someone may be able to confirm if these basses are around in those colors.
I love the aged sparkling burgundy. Never seen polaris white or walnut before either.
Gibson Club #249