Recently I wanted to make some six-sided OBW for a modern quilt I'm putting together but I grabbed the wrong ruler and made eight-sided instead. Still usable I guess, but not what I wanted, I wanted that more walnut shaped piece with the hex.
I made one about 15 years ago and it was a lot of fun, it happened that my favorite block didn't make it into the finished quilt because it didn't play well with the others.
I've seen a lot of them over the years and just have a couple words of advice: (1) make sure your base fabric has large enough/distinct pattern, if it is too small your work just disappears. (2) Beware the animal quilt, while they can be great quite often you end up with a lot of unusable images, unless you really wanted to make a point with horse behinds...