I might not be a giant, or a particle man, but I can come close with OpenCV and Processing. I've been working on this piece for about a week, and it's going to be used as an interactive installation. It's still a work in progress, feel free to share you thoughts about it.
It's hardly mind control because I'm using the accelerometer from the Emotiv EEG to manipulate servos in the wrecking crane. The lego tower that's on the board will rebuild itself if I'm too frustrated. The following picture and video shows the result of five days of work (more updates to come as I have time to work on this project):