If you have a hardy variety, it's not that difficult to collect the seed and this will of course give you a variety of colors. When you find a ripe pod, cup your left hand round it with the palm upwards then gently squeeze the sides of the pod. If the seeds are ripe it will burst open. Most of them will end up on the ground but you should be able to catch a few. They are mid-brown in color. If the pod does not burst open spontaneously the seed is not ripe (white). Good luck - Ian.