How to keep a child busy for hours in the summer: DIY: Giant Ice Cube Awesomeness - filled with plastic animals, dinos, and such. And I'm sure you could put in food dye before its frozen to color it like the ice block in the photo.
What do we think about lights inside of the tulle? definitely more difficult to implement (getting it to lay correctly + finding electrical outlet). I like plain tulle with medium-sized swags like this picture. Wouldn't even need the flowers at the bottom