Just Doodling

You don't need pen and paper to doodle anymore. There are several online tools that will let you get creative and colorful and some don't even require registration. One of my favorites is Bonomo. A blank screen with dancing bubbles is the first reveal when you enter Bonomo. Think of the bubbles as the tips of a paint brush. You can control the pattern the bubbles move in, though not the colors. Still, the element of chance is what makes Bonomo fun.

Some examples of Bonomo fun:

 Some other doodling tools you might be interested in are described in this Mashable article.