Yeah Mick, probably a bit too big.
But, the Stress Ball idea is sound. I haven't been able to test it yet but, I have made some research progress. Remember the T-Shirt Thread? Well, that thing is coming in all sorts of handy..
Enter the prototype Funda Ball:
It's not too pretty to look at right now, but it has all the characteristics we are looking for except for one.. Well maybe two.. Accuracy.
The TFB (T-shirt Funda Ball) is the perfect size for slinging. It weighs maybe a little more than a tennis ball, but it's biconical, meaning better aerodynamics. Also, it's softer without taking all of it's punch out. The main problem with this guy is that he flies in a corkscrew type pattern. It still basically goes where it's pointed, but it may drift a bit. Another upside to the TFB is that it's pretty easy to throw with a spiral. In fact, it's easier than throwing a real football bare handed is... The other downside to this ball is that I think it may have a tendancy to get a little distorted in shape when it hits something. Not drastically, but seems like the nose flattened a little after a couple of throws..
This particular ball took up about 3/4 of a ball of T-Shirt Yarn.