Handmade 5ft oak Bookshelf with a twist by WoodCurve on Etsy, $469.99
Love this! This is such a fun and interesting way to incorporate storage and functionality into a home. Also it reminds me of the scene in 'Kate and Leopold' when Hugh Jackman shows Meg Ryan the hidiehole in the fireplace mantle.
Lay a thin strip of "backsplash" tile in between the large tiles, instead of just using grout.