Below is a step-by-step photo tutorial on how to make an edible lamp post and fence post for a gingerbread house house. I used this method for the edible lamp and fence posts for Heidi's Gingerbread House.
To make the edible lamp
Place a small yellow gum-drop onto wax paper.
Place a dot of Royal Icing onto the wax paper, about the same size as the bottom of the gum drop.
Squish gum-drop onto drop of Royal Icing
With Royal Icing make a line from the top of the gum drop down to the bottom, lifting slightly on the bottom to form little hooks (or whatever shape you desire).
Place a small drop of Royal Icing on top of gum drop and place a black dragee on top (if desired).
Make more than you think you will need. Let dry several hours.
To make the edible lamp posts
Choose your desired marshmallows (20 jumbo or 40 regular). There are many different marshmallows on the market now, in a variety of colors. If you cannot locate colored marshmallows, add paste food coloring when the marshmallows are melted.
Melt 1/4 cup (1/2 a stick) margarine in a large pan on low.
Add marshmallows (20 jumbo or 40 regular).
Keep stirring the marshmallows gently as they melt.
Stir until smooth then remove from heat.
Use some form of crispy rice cereal (plain, fruity, or chocolate).
Approx. 6 - 7 cups of crispy rice cereal.
Add crispy rice cereal to melted marshmallows.
Stir well until combined.
The mixture will be hot - let cool for a few minutes until you can handle the mixture! Make sure your hands are WELL GREASED! (use butter or margarine).. very important or the mix will stick terribly to your hands.
Place about a golf ball/baseball size of mix into your WELL GREASED hand.
Roll and press the mix into the desired post size.
Lay on wax paper to harden (make more than you think you will need).
With Royal Icing, place onto your gingerbread display where desired, attaching your wrought-iron fence (as needed).
Place a small amount of Royal Icing on top of the fence post and place your now dry/hardened Lamp fixture.
Lamps can also be placed under the porch as light decorations.