I know this isn't the best photo of the decor.  But I wanted to share what the decor looked like.  I bought blue tulle from Michaels (with a coupon).  I draped it from our ceiling fan, and extended it out toward the walls. I found star cut-out shapes at the Dollar Tree.  I glued them back to back so that there was color on each side.  I also found Wall E stickers, and placed them in the center of some of the stars, as well as the number four(I printed them from a computer program also) to represent the age.  I hung the stars from the tulle using fishing line.  I bought the balloons at a local party store.  At this particular store you are able to purchase "loose" balloons.  This way I got only what I needed, which saved me money.  I spent right around $20.00 for what you see in the picture above.