For HJ colours i'd choose (in no particular order and body style and trim dependant):

Sepia
Satin Mist
Absinth
Claret
Royal Plum
Papaya
Tuxedo
Bordeaux

I'd love a HJ Kingswood Sandman in Sepia, Satin Mist, Tuxedo or one of the dark red wine metallics. For a van i'd choose one of the brighter colours mentioned. For me the extra chrome on the Kingswood looks better in the darker colours whilst a HJ van with its lack of bright and slab sides suits a colour like Papaya or Absinth. Plus I would probably put HJ stripes on a van and I like black ones better which come on bright colours, but I reckon HJ Kingswoods look better without especially white stripes which come on darker colours normally.