Flower arranging is SO easy; anyone can do it. Really.
All you have to do is find a container - basket, bucket, wagon, use your imagination!
Put some styrofoam in the bottom.
Get some fake flowers. Garage sales/craigslist/freecycle/clearance at Michaels are all great places to score lots of pretty flowers.
Stick the flowers in so they are varied and look full.
Enjoy a pretty centerpiece that doesn't have to be watered and will never die :)