Butterfly pattern

download .psd

to make it into a pattern, open it in photoshop, then go to edit > define pattern

now when you use the fill bucket, checkmark "pattern" on the settings menu (usually at top of the window) 

and choose the desired pattern from the drop down menu

then fill and see your pattern!

you can do that with your own patterns too! ^^

Use offset to move patterns and fill in spaces so you can make them repeating~