In this instructable, I'll show you how to make a little bubble. (PS, I found this somewhere on the internet, this is not my original idea.)
Step 1: Clouds!
First of all, pick your two colours you want your bubble too be. I chose a dark and light blue. Then go to Filter> Render> Lens flare, and use the default settings(I forgot to do this, this will make the bubble look shiny). Then go to Filter> Render> Clouds.