I think I would design something similar to the Nexus Revo. I think it needs stronger vibrations and better patterns though. Also maybe a remote control that would let you change the patterns and maybe something like a scroll wheel to let you change the speed/direction of the rotation.

My mind is full of new ideas for sex toys.

I would design a biofeedback and neurofeedback sex toy. Biofeedback means to control the toy with your body functions and neurofeedback means to control with your brain funcitons.

Maybe you know the Mattell Mindflex, a game that measures your brainwaves and brainwaves which are linked to concentration cause a fan to blow.

But my vibe would be the opposite:
Brainwaves which are linked with deep deep deeeep relaxation cause the vibe to vroom. So you are just able to cum if you are deeeeeply relaxed.

Would make a toy similar to the we vibe III that is wireless remote control. Able to be worn in public. Controled by iphone or ipod touch. Would be water proof, rechargable and have a range of miles due to bluetooth technology. Amazed it does not exist yet.