Sprout makes some of the best salads that I have ever tasted. There are tons of toppings to choose from, most of which are vegan. For $5.99, you can design your own half-portion salad with a "greens" base of your choice (spinach, arugula, gourmet mix etc.), plus any six "standard" toppings of your choice (these include many fruits, nuts, seeds, veggies, grains etc.). For $0.50 to $1.00 extra, you can add a "premium" topping (caramelized shallots, for example).
The half-portion salad is HUGE and comes with a slice of fresh whole wheat bread. I can't even imagine ordering the full-portion version.
My favorite salad that I have designed at Sprout consists of: gourmet mix with orzo pasta, tortilla crisps, mango, black beans, sweet corn and chili-lime dressing. Yum!
One caveat: Furikake is a Japanese seasoning that often contains fish, so the furikake-crusted tofu (on the "premium" toppings list) is probably not vegetarian. However, there is plain tofu on the "standard" toppings list that is vegetarian.