Yes you can! We encourage you to blog about your overall experience, however we must request that you do not publish any scripts or solutions for systems within our labs. The reasoning behind this is simple: if a future, or current, student should come across your notes and scripts in the course of their research, they would likely use them rather than finding solutions on their own, thereby missing out on the educational process that you went through to come to these same findings.
We also further request that you do not publish any screenshots or images from our labs as they contain proprietary information.
If you would like us to review your blog post before publishing, please send an email to "challenges AT offensive-security DOT com".