This sketch was done using:

What I love about these brightly coloured gel pens (apart from the 80p for five price!) is that they instantly make you smile. I doodled out some squares and rectangles floating in space, then just put a wash over the top. The pens are not waterproof so there was so bleeding. I think this added to the harmony of colours and I would like to develop the gel pen – watercolour combination further.