This has been one of my favourite styles of doodle ever since I was a child! Here's how to draw it:
1. Randomly draw some dots or stars spread around the page. I find that 7 is a good number.
2. Choose one point and draw lines connecting it to all the others.
3. Choose another point and connect it to all those it is not already connected to.
4. Continue until all the points are connected to all the others. Colour it in if you like!