I like crochet because it's very forgiving. And it's quick. And fun. And relaxing. But mostly forgiving - you can pretty much do your own thing and stuff still turns out great. :)
I didn't really use a pattern or anything. Just work up your first row of single crochets until it looks about right for the center, then turn, putting a few extra stitches in the end to make up for the turn and just keep going to your heart's content 'til you're happy. Like I said, very forgiving craft, that crochet. (If you want some actual real steps on how I did this, contact me and I'd be glad to help with more detailed instructions.)
Anyway, it worked up in a few hours. Probably would've been less than that -but I had a really great "helper". So...you know how that goes.
This kind of thing is really fun and easy to do. I also have another great big - like huge - full room-sized one of these that's been in progress since last year. All kinds of colors. A project like this is great for when your hands want to be busy but you're uninspired or just too tired to focus on anything more complex. Here we go - picture of the big one.