These new themes are pretty darn good, I especially like “Construction”, “Contoso”, and “OARP”. I could see them being changed up and used for a lot of company intranets. I do wish they would have packaged them as a WSP or something rather than just give us a solution file and have us make one ourselves.
Download them from Microsoft
UPDATE: Daniel Brown made a WSP for easy installation
Here is a screenshot of all of new themes at once and then each one individually full sized. Click for larger versions:
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