Positive camber can wear them like that too (well almost). Camber wear will show as a smooth wear, whereas toe wear will be a scrub type wear (tire will be feathered). Setting toe is very easy, but you should take it to an alignment shop. Since your car is lowered, I kinda doubt that it's a camber wear. Also, both sides would have to have to have significant + camber to wear the same on both sides. Also, it takes a lot longer for camber to wear tires as there is very little rolling resistance. Toe will wear pretty quickly as the tires are constantly being 'scrubbed'.
Tim