Then, use the site's step-by-step instructions to cast the robotic components in silicon. Not sure where to buy your materials? The toolkit offers quick shopping links.
The toolkit site also gives instructions for building a basic control board -- which you can use as-is or modify to suit your own needs -- so you can get your bot mobile.
In addition to helping you build an army of robotic octopus minions, the shared space will help the fledgling soft robotics community to collaborate with each other. By making as many components of successful robots free and easy for others to play with, we can speed up the process of building a better bot.