Check out these exclusive designs for the special edition of the new HTC One Mini created by London-based fashion designer David Koma. The elegant silhouettes and architectural shapes on the aluminum casing were inspired by the designer's idea of “change.” 10 lucky customers in the UK will have a chance to win these exclusive cases by participating in the Twitter challenge hosted by @htc_uk which ends September 22nd. The final winners will be be selected by the designer himself.