I also completed a braided ball. Very cute, very fun, very easy.... well, except for the braiding part. I think I still messed up a little on one side, but it's close. And it really was a 'huh, can I figure it out - kind of project'. I might let the little guy or my dog take this one and pick different color options for the next one.
While I get the premise that you knit in stockinette (and it curls under) and that part of that helps build the bulk of the ball - it still seems kind of wasteful to knit 18 stitches and only have 7 stitches visible because the rest is all curled under. But I did love that after I finished seaming that I just tuck the ends in under the curled edges and pretend like they don't exist instead of weaving them in. I'd rather do that any day.