Yes, the G11 is sometimes called the "Rainbow Bolens", but I prefer to call it the "Sunset Bolens".
Reason being the colors, and the fact that the G11 was the last 'new' model of the tube frame series, and was produced in the last year (1978) that the tube frames were produced.
It's also interesting that the G11 was the only tube frame to have fender decals, and the HDT1000 was the only large frame to have fender decals.
The G11 seems to be semi-rare, and not a lot have surfaced. I have yet to see one with a 4 digit serial number.
I happen to be fortunate enough to have managed to find 3 of them.