This is a very nice abstract. The diagonal is a good idea.
Dave Bonta: Thanks - I'm glad you think so. It seems to me that I use a diagonal much too often, but then I suppose there are only so many interesting ways to arrange things within a rectangular frame!
This is wonderful patterning Dave: we rarely get hoare frosts here where I live in the UK. If there's the slightest possibility I'm there waiting with my camera