You probably have more advice than you need on veggies, but I'll offer a few thoughts as well Carbs are so specific to the person...I do well 40-60 carbs, but others, not so much.
* Frozen veggies. I love cauli and broc. If I'm really lazy (and short on time), I pop them in the microwave and eat. If i have more time, I love to let them cook under the broiler (like Chris mentions).
* Leafy greens. Low carb, full of good nutrients. Spinach, collards, kale, etc. [I sneak them in my husband's smoothie.] [maybe those are your mixed greens?] 2 cups of spinach = 3 g carbs.
* I toss extra veggies in my meat sauce, soups, stews, etc. I'm tinkering with a recipe to mix pureed spinach/broc in things like chili. I'm pretty sure you won't notice them and they'll add thickness.