Well I did some tweaking, and added a touch more randomness to the captcha. It now at least changes every day. The way I designed it I don’t think it will really be to hard adapt it to change for every post on every session. Right now I just don’t see the need.
Here is an example of what the image looks like.
I think I will probably look into the plugins code for wordpress and see if i can’t make this into a plugin.
John's Musings 
Hey, this is working so far. I have had no blog spam at all for 24 hours now!!!