You can just sit them in the garden or inside on a table, but why not make them extra special using Rimar2000's method of stiffening wire
The method involves putting one end of a length of thin wire in a drill, I used a cordless one, and wrapping the other end around something solid like a nail sticking out of a fence. Then turn the drill on. The wire will twist and stiffen becoming quite springy. It will then support the weight of these little drink can insects or flowers. They will sway around in the wind.
Edit: In answer to a question I attached the flower to the wire with Blu Tac. A more permanent solution would be hot glue. Maybe even chewing gum would set nice and hard to form a good bond.