There are plenty of business-friendly, two-tone, black-and-gray mice out there. Logitech's M325c Wireless Optical Mouse ($29.99) is not one of them. It's very small, so it's a good choice to take along with you in your laptop bag, and you can choose from many vibrant color and pattern options that...
Ambidextrous design; Vibrant color options; Unique back-and-forward clicking feature on the scroll wheel
Scroll wheel is a bit too sensitive; Might be too small for many hands