Hydrangeas - make bubble paint (dish soap, tempera or acrylic paint, water) blow using straws to get big bubbles and press paper over mound of bubbles. Beautiful arts and crafts idea. Would work also as craft for frog eggs, add black dots.
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!