The Holy Spirit
We did a brief meditation exercise when learning about the Holy Spirit. The lesson included the Pentecost story. We played a CD with "desert wind" (no music, just sound) and had the kids close their eyes and imagine the wind on their faces and blowing things as they put themselves in the story before it was read. Then when the part of the story came where there were tongues of fire, we had them open their eyes and look deeply at the flame of a candle.
I think it's important to explain and discuss a "setting" that you want them to be "in" while they're imagining. It helps their minds from wandering if they know what they'll be picturing in their minds. Likewise, I think ocean or forest sounds would be good meditation "places to go", playing the CD in the background, loud enough to hear, but not too loud to distract, also having the leader read something calmly and slowly to "guide" them.
Jan at FPC, Napa