Here is an interesting concept from designer Liu Yi, the Toe Mouse. As the name suggest you use your foot to control the toe mouse rather than your hands.
The Toe Mouse is designed to be used by people who have upper limp disabilities and cannot use their hands to move the mouse, and you slip it onto your foot just like you would a pair of flip flops.
It has all the functions of a normal mouse, and you use your toes to click the left and right mouse buttons. This is a great idea, and I can’t believe someone hasn’t thought of it before.
It is just a concept at the moment, lets hope some manufacturer picks this idea up, as it could be a great solution for some people.