Painting With Light

Too wet for a walk to find a tree today, so instead you have some of the results of a 'painting with light' session at photo group this morning.........as usual I couldn't decide which one to post so there is a collage of a few of my other efforts in extras
I'm clearly not an expert at this technique but I was fairly pleased with the results as a first attempt and it was a bit of fun to do..........what is it about a dark room that makes a large group of people turn into giggly children?  :-)