Textured Watercolour Painting

I had a conundrum one night.  I had painted a quick watercolour of my favourite island in Brazil (Florianopolis), but I hated the way the rocks turned out.  I had to figure out a way to fix and disguise them... so I decided to soak some rice paper in glue and create textures.  I liked the way it turned out and decided to try this technique with my students at school.  In addition, I masked out certain areas (which appear white).  It was simple but striking... I've posted my class's results below.