Art therapy: color is so subjective. Never trust color/line interpretation based on a chart. Rather, say, "Tell me about this color. What made you make lines like this." I often show them my art in my studio,where they are working. Their color choices/ meaning do,not change to mimic mine.
In response to the tragedy at Sandy Hook Elementary, the Foundation has developed some simple arts-based experiences that can help children to express and cope with their emotions. Helping Youth Cope with Tragedy through Creative Expression [PDF].