It would take us years to tally up Austin's near-countless cultural gifts to Texas, not to mention the rest of the country, but a good place to start might be the national businesses that originally found their roots somewhere around here. A lot of the original locations for these companies weren't exactly glamorous, but that's the scrappy startup saga every aspiring entrepreneur wishes they could call their own -- and believe it or not, some of these brands are large enough now that a lot of people have no clue they originally found their legs in our . . .