Yes ice cop, i did get my citizen though my work. back in 90's you would see lot of people getting sponsored through their work. I dont mean any technical work but from any restaurants, or gas station, or any grocery store. If the owner was willing to sponsor you and if the business was going on profit then you got your green card. It was just matter of time. They would sponsor you as a skill worker in the  field you work for. It did not matter what status you were in. You could be f1, or b1 or out of status. things change a lot after 9-11. I think you sill can get you green card like that but it is much tougher . Now you can get your greencard only through h1 or dv lottery or  you have to marry somebody, like most of the peope have been suggesting here in sajha . back then you did not have to marry anybody to get green like we see nowadays. Good luck for anybody who has been trying to get green card. No hard feelings brohers. live your life and let other live.