I think it will be nice if there was an option inside the Admin to set bagground etc, for the CAPTCHA, not easy for all to do it in the code.
Why not just upload your own background image via FTP?
I think CAPTCHA should be a framework and different webmasters could upload different implementations. I, for one, would prefer a CAPTCHA that is not image based.
is there a captcha that uses the eval() function instead of phpinfo() because thats what i have on my server
I think there is but I'm not 100% sure.