The photo above is my attempt on making a petal hood for my Canon Kit Lens. I even opted to upgrade it with a rubber-band to hold it securely. Also in the photo laying next to my camera is the Canon OEM round hood.
I occasionally just use my hand to block out the suns beams but I guess the cool kids are not doing that these days. Anyway check out the site they have lens hoods for most popular Canon, Nikon, Olympus, Pentax, Sigma, Tamron, and Tokina lenses. They even have a custom hood maker that says it is for registered users but I couldn't find a link to sign up for it, but it could be because it is a new feature.