Stylize CAPTCHA to be different colors?

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The orange and blue coloring really loooks out of place on my site. I've seen and used different-looking CAPTCHAS before, but I'm not an expert on it. There was one I used where I was able to change the color from blue to black with CSS like this one:

http://www.historicaldesign.com/index.php?page=contact-form...

I can't seem to find where I could maybe change the style for the CAPTCHA.

I am using it on a form, not a guestbook. Regular Contact form that sends and email.

 
Remo replied on at Permalink Reply
Remo
I've got a patch at work that allows you to define some constants in config/site.php but you can actually do that on your own.

Just have a look at concrete/libraries/3rdparty/securimage/securimage.php there are a couple of class variables you can modify
buurvrouw replied on at Permalink Reply
buurvrouw
Does someone know what file to edit to get a different background color on captcha image?