Logitech's Darkfield Mice
Although we've seen press shots of Logitech's Darkfield mice, which claim to be able to track even on glass surfaces. Here's a few photos of what they look like outside of studio lighting. They're rather pretty, we think.
The larger, weird-shaped one is the "Performance" which costs £90, whereas the smaller one is a travel-size option for your laptop that costs £70. Both are available now.