I love a little punkiness or a little tough, but I have no desire to dress like a 12-year-old Hot Topic wannabe (I'm 27), and most of the places I shop (I'm cheap! thrift/vintage, H&M, sales) aren't very heavy on the punk influence. How do I add some punk or tough influences to what I wear, and where do I look to find pieces that will help me do this?

Lucky me, I'm a postdoc, so I can wear whatever I want style-wise--the only limits are basic modesty/politeness, comfort, and what I actually want to wear!