I'm searching for a captcha solution that will integrate with Joomla 1.5's native contact form.
I've tried this solution on Google Code, but it fails to work.
I can't find any current solutions.
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Joomla 1.5 is outdated and not longer actively maintained. Joomla community of developers is working Joomla 3.
You are not going to find new extensions supporting the latest captchas. You can only develop your own custom code for this version and try to keep it running.
You should definitely migrate to a stable and safe release (3.3.x). 1.5.x - 2.5.x are not longer being maintained.