Make a wind chime out of old keys and acrylic paint. - This site has lots of cheap outdoor/backyard ideas. I can't use most because I live in an apartment - but I love the old key to windchime and spray painted folding chairs.
Rainbow Bubble Snakes - Need: Half a waterbottle, rubberband, bubbles (dishsoap/water), food coloring, sock. Steps: Dip sock held by a rubber band on the water bottle in food coloring in dish soap and food coloring and blow. Have fun!
Cherry tomatoes and black olives make cute lady bugs. Base is made up of sliced bagettes, cream cheese, smoked salmon and flat leafed parsley. Sprinkle ground black pepper on tomato and using a toothpick dot some cream cheese on the olives for the eyes.