The Swedish Log Candle - This is great for camping. You could also have it at a party to roast marshmallows over. Survivaltek tells how to make it. Would probably be pretty cool looking on the patio as long as you put it out before it burned all the way to the concrete.
Simple, clean fence using cattle panels. Could be an inexpensive but strong deer fence solution if a second cattle panel was run across the top to make it twice as high. Cattle panels cost about $20 for a 50in x 16ft panel.