I wear blue shirts all the time. I've even worn a lavender with a gray suit before. looked awesome. In my opinion, if you know how to do colors well, then do it. You will stand out a bit and look more confident than the standard white shirt and red tie crowd. I have gotten SEVERAL compliments about my dress and comments such as the one I just said. My fav. interview suit is a dark charcoal gray with thin alternating pinstripes of cream and a burnt orange/copper color. I wear it with a medium blue shirt and a tie that has some a little bit of blue, little bit of cream, and that same burnt orange/copper color.