Related party themes:

• Transformers
• Robots Party Supplies from Plum party
  

• consider using ironing board cover fabric  for a tablecover.  Cut a square piece of metal mesh for the cake to sit on. (on its cake plate or cardboard.)  Sprinkle silver confetti all around the centerpiece.
  
  
• Decorate with bunches of turquoise, red, and silver or gray balloons, using silver curly ribbon...
  
  
• Serve "nut and bolts" snack mix (peanuts, m&m's, mini pretzels, sunflower seeds, and peanut butter chips... fill clear cellophane bags and tie with silver and turquoise curly ribbon...
  
  
• Also serve pizza, breadsticks, and drink boxes.
  
  
• set up a craft area and make robots!   Here is a link for robot craft activities.  Or you can just provide construction paper, crayons, scissors, special-edged scissors, glitter, glue, and tin foil.. and let them use their imaginations to "invent" their own robots... Rodney would be so proud!
  
  
• Word your invitations:  "LIVE from Robot City.... Alex is turning 4!"...
  
  
• Party favor ideas include:  robot erasers, glow necklace, pop rocks candy, robots stickers, robot bubbles and silver foil covered Hershey's Kisses... most can be found at Birthday in a Box.
  
• Watch the movie, Robots!