if you have cool designs that appeal to people, you shouldn't have to use gimmicks. if i saw a bunch of people with wierd haircuts dressed the same at the mall, i would most likely avoid them, much less buy what they're selling. just set up a booth, make your designs visable, and the business should come to you. at our malls, they have like those typical vulgar/pop culture/parody t shirt booths, and a lot of people notice them,stop to read them and look at them without any coercion of gimmicky sales staff. i assume they do good in business since they've had booths at our malls for like, a really long time.