The modern design decals are available (same styling as the MAMBO prototype).
But your right they were not factory offered.

Just like this:
jon_evans_vy_van_003.jpg

mambo_van_001.jpg

grean_sandman_1.jpg

Of course the VE is an AMCAT build and really shouldn't have Sandman on it at all.
But it shows the design.

Some personal expression:

another_yellow_vz_van.jpg

DSC_0290.jpg

Regards, Smooth