Feedback appreciated

I have recently added the themeswitcher plugin to my site, and adapted two new themes I particularly like (“Island After Sunset” and “Platinum”). I would be interested in feedback on the overall design. The two aforementioned themes and layouts give a distinctively different look and feel to the site. I am wondering if the other two (“Falling Leaves” and “Misty Look”) are simply redundant, though they do offer different looks and color schemes. Having four themes from which to choose is fun, but I am wondering if I should simplify to just two or maybe three options.