This plush toy has seven legs with different textures at the end of each one. The only thing it is missing is vibration or other movement. It is very colorful, which could be a good thing. However, I have read that for children with cortical vision impairment, fewer colors at one time are best. Brio Activity Snake is a similar toy, but it includes sounds in each section of the snake.
Many places make rattles that attach by velcro around the wrist or ankle.
These are good for trying to promote leg and arm movement. However, I haven't found any that are sensitive enough to respond to slight movements. You might do better to try to make your own. Here is a cute commercial one, though. A tape player with headphones might be a good idea for your child.