I had always thought it would be cute to throw a "Robot Party" for my kids. I never did, because they always had other themes they wanted to do, but I did incorporate some of my ideas into other parties.
MAKE A ROBOT
For my middle son's 8th birthday we did something similar for a Transformers Theme...only in stead of odds and ends we used legos. The original plan was to have each child make a car or plane, and then re-use the same pieces to "transform" it into a Robot. Because of time we just let them make a Robot or a Car or Plane.
We also made robot shaped crayons for party favors at my son's Transformers Party. They were a big hit.
Making crayons is pretty fun. First, you need a mold. Any plastic candy mold or silicon mold will do--but for safety reasons you should not make candy in a mold you've used to melt crayons. You can find an assortment of Robot molds here.
There's several ways to melt the crayons, but the way I've found works the best is to melt similar colored crayons in each section of a disposable muffin tin in the oven between 200 to 300 degrees. Start low and raise the temp if they don't seem to be melting fast enough. They should melt in about 15 minutes. Then I use a plastic spoon to spoon the different colors where I want. Make sure to cover the area well with paper to catch drips, because melted crayon is a bear to clean. You may have to stick the tin back in the oven again if it starts to harden.
I did not use a disposable muffin tin when I did this. I thought the
muffin cups would protect it. Alas, it doesn't protect from drips.
If you have a silicon mold, you can just put the crayon chunks straight in the mold and stick them in the oven. Unfortunately that would not work with the clear plastic mold I used for the Robot Crayons above, because it would melt right with the crayons.
Several years ago my son came home with this hand-made Robot valentine. It would also make a fun party favor. The paper is folded in a triangle (sorry...I don't have a side view with the candy items glues on--Rolos for eyes and hersheys for feet. They glued a bar-code for the mouth (which would be collected or printed) and made arms out of tin foil (also glued on).
Anyways, there's some ideas to get you started. Of course there's lots more on pinterest (definitely check out the free Robot Printables There).