In case you didn't follow the link in the plug for my website, I had a little project a while back of trying to discover 4D Johnson solids. I have a new one up now, and since this IS a 4D-minded forum, I figured some would be interested in an update. It's projection into 2D at a certain angle is, interestingly, Metatron's Cube.
http://www.lokiclock.com/still/3dren/j4d/index.shtml
http://www.youtube.com/watch?v=U3Y70qCWPWQ