Have a look at all posted ready-made lamps...
Idea: Claudia Hamperl, Coburg
Pendant made out of plastic bags, safety pin, socket E27, low energy bulb 11W
Take plastic bag and cut hole in the middle of the bottom. Shuffle the bag together. HOld it. Take next plastic bag, cut a hole in it, shuffle it together and so on. To fix the shuffled bags use the safety pin. Put plastic bags over the socket and screw in bulb.
Tadaaa - here comes the colourful, floral, plastic bag lamp.
Use only low energy bulbs!