[header] How to the mesh tool in adobe illustrator [title] Select different swatches of blue for the mesh cloud. [step] You can follow some combinations of blue on the illustration below. [title] Using the third blue from your swatch box (or any blue, for that matter), create a graphic cloud. 
[step] Create the cloud by using the ellipse tool and by placing different sizes of circles on top of each other. [title] From your pathfinder's tool (or box) click unite to merge the circles together.