tell us a few basics.
how many legs do you want, 2, 4, 6, 8. a 'walking robot can have any number of legs'
second is what size do you want to make it? do you want it the be the size of the robot Ro-Bot-x posted or do you want it to be 1' tall, 2' tall etc.
why are you making the robot and what do you have to focus on. e.g. come up with a new/smarter control software, come up with a better designed set of electronics for optimal operation, or increase the efficiency of the mechanical components?
give us a few parameters and we will be able to help!