When the deer Christmas light forms start to rust, and the wires and bulbs wear out, spray paint that thing brown and prop it into the garden. Add a bush or vine (plus several months) and you have affordable topiary
. This is a good way to recycle and save money; if you shop for topiary forms, they can cost several hundred dollars.
Add the right topiary plants for your area. Typical topiary plants yew and boxwood take a long time to grow into form, for faster results (not years) use English ivy or something similar.
Stuff the inside of the form with peat or a compost/soil mix, this might work to help the vine along. Stuffing it and planting grass on it would probably give a fun green-fur texture; add two branching plants in the head for live antlers.
I plan on doing this sometime this spring/summer, I'll post pictures if it's a success. This would be fun with other Christmas light forms too; I'm thinking green snowman or penguin.