Nuts (pistachios have the best amino acid profile), seeds (especially hemp, pumpkin and sunflower), tofu, tempeh, seitan, lupini beans, edamame, vegan meat and milk products. Homemade hemp milk is fantastic.
Also, if you're worried about overloading on soy, it's simple to make tofu out of hemp or pumpkin seeds -http://www.postpunkkitchen.com/forum/vi ... id=2372342http://www.postpunkkitchen.com/forum/vi ... id=2371315
You can even make your own soy free tempeh if you're really hardcore about varying your protein sources.
Tofu or tempeh scrambles/stir fries are easy and delicious low carb/high protein meals. You can also make tofu omelettes (this recipe is delicious but there are some carbs in the chickpea flour - http://www.wellsphere.com/vegetarian-ar ... tar/746521
) or a vegan quiche (minus the crust if you're really watching carbs) - http://www.savvyvegetarian.com/vegetari ... quiche.php