Remember that bit in X-Men where Doctor Xavier goes into Cerebro and you see the full scale of the mutant population on Earth? Yeah, well, don't you think that within those thousands of mutants there must be a few with quite rubbish powers? Like the ability to brush their teeth really fast or remember train timetables. Is that a power? Probably not.
Anyway, one mutant who definitely has skills is Havok, who first appeared on screen in X-Men: First Class, and was played by 23-year-old Lucas Till. The X-Men wikia describes Havok's powers as the 'ability to shoot or emanate plasma in the form of a blast or discharge, with a telltale concentric circle pattern'. But it's basically just massive hand lasers.
Till was meeting the fans recently at the 2014 Comic Con in San Diego, and he did it in a rather excellent T-shirt and skinny black jeans combo. If a fully patterned tee is a bit much for your steez, a block colour or print motif pocket can bring a bit of party to an otherwise plain top.