Getting Patriotic!

Bloggers may remember last year I planted 'black' veggies as a living reminder of my lovely dog Buddy. Well, Matron has had an idea for veggie planting in 2012. I'm trying to think of veggies that are RED WHITE and BLUE to celebrate the Queen's Diamond Jubilee.
RED? well that's easy.. there are lots of those on the allotment.
WHITE? Well that might be a bit difficult
but I can think of a couple of veggies that might pass for white.
But BLUE? How many blue veggies can you think of? This is a heritage variety Kent Blue pea which was given to me by Sue last year.
I'm struggling with RED WHITE and BLUE fruit and veggie ideas. Can anyone suggest some?