Soak the bottle in very warm water for a few minutes
Then empty it, pull off the colored bottom part and peel off the label
Clean the glue out of the bottom part
Put a layer of small rocks in the bottom part
Put potting soil over the rocks and then put in your plants
Be sure to press the roots of the plants down
Add more soil around your plants to fill the planter
Arrange pretty stones, tiny sticks, or tiny toy animals around the plants
Use a sharp knife to cut the top off the clear part of the bottle (about 4" from the cap)
Turn the clear part upside down
Slip the cut edges into the planter to make a dome top
You can glue an artificial flower or bug to the dome for decoration