Purple is becoming a trendy colour for vegetables. String beans now come in yellow, green and purple - however, the purple ones turn back to green if you cook them.
Pepper also come in purple these days, in addition to the yellow, orange, red most of us are used to. They also come in chocolate brown.
Radishes are available in white, pink, lilac (a pale purple), red and green.
The corn that most people call "blue" is in fact more purple than blue.
Broccoli
purple and green
Green beans. The purple ones turn green when you cook them.
Green beans are a vegetable. Green cabbage also is a vegetable.
purple, green, and gold
all green vegetable
eggplant
While it is botanically a fruit, an Aubergine is considered to be a culinary vegetable, it is purple and begins with 'A'.
Broccoli is a green/purple vegetable that looks rather like cauliflower. leek is an onion like vegetable that grows long and fat. The soup in question is one made using these vegetables.
Purple and green flowers!
Eggplant.
Saffron is called Vegetable Gold. It is actually a purple flower.