I'm using re-captcha, as one of my spam stoppers, for the image comments form on my zenphoto website. Is there anyway to change the recptcha box color to white?

As it stands the recaptcha box is red, and it just doesn't blend in well with the rest of my website.

I can't use the Zenphoto captcha because it's doesn't seem to work. The letters/numbers never match what zenphoto wants typed in.

You probably will have to code a bit in the plugin:
https://developers.google.com/recaptcha/docs/customization