The backgrounds they made were absolutely gorgeous! One girl started out by saying she didn't like orange, and I had given her Tangerine Tango as one of her colours. But she went ahead with the technique and ended up loving it. The class samples are posted below:
I think they all did great jobs. Some have bought watercolour paper and are going to try this at home. By the way, I had them tape the watercolour down with Washi tape and one student commented that she has finally seen a good use for this product - and ordered some.
The photos I took of the class are a bit dark. Afterall, it was evening.