I've volunteered myself for the duty of creating flower arrangements for the restaurant. It really is amazing how much flowers can warm up the place. I snapped a shot of the vases before I carted them off:

The tickseed, lemon mint, and yarrow are from my yard. The pansies and the flowers I don't know the name of (one with white edges) are from my mom's yard.

I've picked flowers and stuck them in a vase before but this is the closest I've ever come to "arranging." My method has more less been pick something green for the background and then fill in with flowers....just kind of eyeballing what looks good.

I'm sure any professional florist has more complex methods or "tricks." So I'd love to hear anyone else's tips, tricks or suggestions for making a flower arrangement.