Today i took a generic plastic lens cap and cut out a rectangular hole in the middle. So i saved myself some money by making a small compact lens hood for my 40mm f2 lens. What do you guys think? http://singaporephoto.blogspot.com
IMHO, tulip/petal design is good for wide angle lens. Fix focal lens will gain more with good design (and accurate calculation) tulip shape lens hood. But not for tele lens, because if you want to make accurate tulip/petal lens hood, the lens hood will become very long.
I agree with you to have black colour inside the lens hood.