As I was getting frustrated with my attempts at abstract with watercolours, I decided to try the same basic idea in acrylics - knife painting and spraying water on the wet paint. Lots of yummy colours. Much happier with the results, particularly after I applied a gloss varnish on top so the darks really pop.
These are fairly small canvases (about 25 cm in height), so easy to manage. I'm currently trying something on a bigger size, and let's just say that I'm glad I put a dry-cleaners' plastic cover on my worktop before I set to work.