Trader T needs a new design

Trader T

Start up - Cool new product.

I am creating a PVC pocket to keep public transport tickets (busines card size).
I am looking to launch with 4 seperate designs in the series, so looking for either 4 ideas from one designer, or 4 spereate ideas from 4 designers.
I am interested in city scapes. I am also interested in contemporary, unique, modern designs, appealing to both male and female. Design that customers would want to show off, like art in your pocket. I'm open to graffiti.
I am looking for full design on the outside, then http://www.tradert.com.au on the inside.
The specs are: 21.0 cm long x 7.2 cm wide. There is an image attached to show the concept (not design asthetic.)

My customers are 16 - 40, male and female. Contemporary, interested in stylish things. Looking to personalise their belongings (IE phones, ipads etc) and this is an extension of the expression of their personality. Want to have something cool, edgy.