How can i make a flower out of the tops of copenhegan cans?

I've seen it on my big redneck wedding but cant seem to find it again. Or how to do it. I would like to do it for prom, i need a step by step on how to create the flower. And if it needs to be welded or what.

As much as I hate to reference an eHow article *cough*hackwriters*cough* - here's all I could find: