Ideas for t-shirt e-shop

Hello all!
First of all sorry for my english…
I am currently developing a t-shirt selling site for a friend of mine . The site targets to teenagers mostly. The problem is i cant think how to design it…is like my mind is stuck. I ve made some grunge designs but i dont feel that are propriate a site like this. Can anyone suggest a style i should follow for the design of this site?:ear: