the only limit is your imagination and your pocket book.How about multi-levels,different shapes(built a peanut shaped deck years back haven't seen one since),roof or trellis to shade the sun on part of the deck.Could go on and on.Many books and mags in the grocery store check out and the home centers will have more ideas.First thing you should do though,is have a good grip on your check book. Keep us posted as to your progress Milton.Luck