What do you do when you want to have a big monster for your live-action game, but you have a limited budget? You get creative.
For something cobbled together out of PVC pipe and upholstery foam, this Alien Queen from Mandala Studios is pretty damn impressive. From the pictures posted to their gallery it looks like the fully articulated puppet-slash-costume stood close to twelve feet high at full extension and was close to twenty feet long. Follow the link for a detailed look at the buildup.
I almost wish they hadn't posted pictures of the queen in full daylight, since they serve as a good example of why darkness is the best friend of anyone working on a low budget. That's not to take anything away from the builders. It's still a bang up bit of work, but it goes from looking good to looking great once the sun goes down.
One of the lessons I learned from working on Halloween haunted houses is that everything is scarier, and looks better, in the dark. Props that might look ridiculous in full daylight can be terrifying once you turn down the illumination, add a little colored lighting, and give the scene some mist from a fog machine.