Use Template:Flag, Template:Cockade, Template:Symbol, or Template:COA.
The templates should be used like this:
{{TemplateName|Image.filetype}}
Next you should provide a decription of what the flag was based on, after that you shoould type the steps. The top of the steps should be:
#Draw a ball with a black outline.
The bottom of the steps should be:
#Add the eyes, and you're done!
At the bottom of the section you should use Template:Flag-auto to provide the colors which you would need to draw the ball in hex and RGB values.
{{Flag-auto
|c1=Name|h1=#HEX
|c2=Name|h2=#HEX}}