This is a fun project that's easy enough for the kids to do, and it can be as elegant or as simple as you like. All you need is a small jar, such as a baby food or small jelly jar with a lid, and some cotton.
1. Make a small hole in the lid of the jar.
2. Fill the jar with butterfly food.
3. Screw the lid tightly onto the jar and poke a small piece of cotton into the hole.
4. Invert the jar and hang it in the garden.