Preheat the oven to 450°F.
Place the pizza crust on a baking sheet. With a basting brush, coat the pizza crust with half of the olive oil, up to 1/2 inch from its edge.
Cut all the vegetables crosswise into thin slices, no more than about 1/8 inch thick.
Arrange the vegetables on top in an attractive pattern, giving each its own segment of the pizza or mixing them as you like. Brush with the remaining oil, sprinkle with salt, and then, with your fingertips, crumble the oregano over the vegetables.
Bake the pizza until the crust is crisp and the vegetables are just beginning to turn golden, about 10 minutes. Remove from the oven, garnish with basil, and cut into slices.