I first saw the Catherine Wheel pattern on mikeyssmail site on YouTube a few years ago. This guy has some great instructional videos posted, even if some of the crochet terms he uses drives me nuts ! Mikey has instructional videos posted for two variations of the Catherine Wheel: the first is made of double crochets, and the second is made of treble crochets (Mikey calls this a Jumbo Catherine Wheel).
My version is the Jumbo Catherine Wheel, but I usually put a twist on almost every pattern I make. This version has two variations. Only 1/3 of the rows follow the pattern. The other 2/3 of the rows are "airy" versions, what I call "spokes". I was concerned that the finished piece would be very dense, so the 'airy' wheels were created to combat that.
The other variation is that each row takes a 90 degree turn about half way through. I came up with the turns to break up the monotony of row after row after row of the wheels. With this technique the variations are literally endless.
I used four colors of Red Heart Super Saver that I frogged from afghans I made a few years ago. I used a G/6 aluminum needle. The finished piece is about 4' x 6', but I'm considering putting a border of single crochets to "frame" it.