1) Yes, we'd love to have more mood themes! Email me (firstname.lastname@example.org) and I'll give you the info.
2) Many of our mood themes are available under our open source license, yes. (Some of them are DW-specific and non-free, because we have the rights to use them but not redistribute/relicense them.) Anything in this directory in our source code repository is licensed under our standard license (your choice of GPL or Artistic). If something's on the site, but not in that directory, it's not available under a free license.
If you are unable to use this captcha for any reason, please contact us by email at email@example.com