The Arts Collaborative theme is based on the industry standard Genesis framework. I added the Genesis Grid plugin to the home page and I think it turned out very nice. Also includes a post expiration plugin to keep the content fresh and up to date by scheduling it ahead of time, through the CMS – WordPress interface.
Completely responsive. Take a look at the range of sizes by horizontally compressing your browser from largest size (desktop) to smallest (mobile-friendly), and everything in between.