I want one of these, myself...

[Bob in a quantum-state-of-faith]

Blue potatoes are d'bomb!  Occasionally you can get some around here, as potato chips (crisps)... good eatin'

Alas, they are not "bible-y" enough to find them as raw tubers in the produce section... 

[Aggie]

silkie chicken? serve with blue mashed potatoes, purple corn, purple cauliflower, and exotic carrots.
  a halloween treat all year around!

I was thinking a side of sugar pumpkin and some crosne tubers: