So--take any old pattern--say the daisy that probably every doodler in the world chooses as his/her first doodle. Add a dash for decoration, a circle, a slash. Make some dark, make some light. Keep adding more on 'til you've got a bunch. And hey! That old overused pattern looks kind of nice.
It's sort of like making goulash. There isn't much in the house, so you fancy up what you've got.