If you didn't already catch it, here's a cool video from Vimeo member Real Pictures showing you how to make your own explosions with a DIY Air Canon. No instructions on making the air canon, but you can throw those questions over at the video page (here). [Thanks Dave]
This is great. We've done our share of DIY explosions. http://YouTube.com/pbjbrand
Andy, you can buy the blue filter to achieve that effect here: https://www.youtube.com/watch?v=oHg5SJYRHA0
These guys are running a Kickstarter campaign where this is one of the rewards. For $50 you get their plans for this, a tutorial on how to make it and a list of the parts they use. It's in the Indie Action Movie Pack and it comes with 9 other tutorials including sugar glass, gore, bullets, etc.
any idea which filter is the blueish one?