Sometimes I like to avoid paper. In that case I draw directly on the wall. I roughly sketch out the approximate size with pencil and then just go wild with the brush.
Here are some images from 2014 painting session in Geometry Global office where I worked while I lived in London. In order to make some dull meeting offices more fun, I used orange, navy blue and red that were the agency's brand colours. My colleagues tell me the paintings are still there! This was all done in my spare time, for about three working days.
*This is me in the photo, drawing in my green jumper.