Number Eight used to have coffee beans in the upper left; now it uses a close-up photo of my coffee pot. I guess you could make an analogy to growth and development in progress to completion, going from beans to the coffee maker to the pot, but I just thought the photo was cool.
Number Nine has always been done with Kottke in mind, even in past random skin series. Love him or micro-hate-ronize him, he was keeping a weblog before a lot of us were, so my incipient site was structured after his. Redoing an old but fun layout in CSS is a homage to old days being made new again.
Number Ten used a photo of the Ateneo Grade School Rock Garden. I opted for a different photo in rethinking the layout, but kept things simple. It was when I first made Skin#10 that I was introduced to the revolutionary new concept of using CSS rather than tables for layout. Immediately afterward I went back to the nine prior designs and redid them in CSS.