Step 1: Parts, tools & links
# Blue or green material, 2 x 2 meter - 5~10 Euro
Use a good blue or green color! More information about this on Wikipedia. I bought my material on the market. Think about light reflection and stretching!
# 4x tubes 2 meters - 15~20 Euro
I used 4 centimeter waterconducts.
# 4x bended (corner) tubes - 5 Euro
Also used for waterconducts.
# Hard PVC glue - 6 Euro
For the waterconducts.
Please read before you start a lot of information about chroma keying.