Here's Calvin's slip-stitch pattern up close.... And Ripple's, erm, ripple stitch pattern......
And the two of them, side by side.
I won't say who my favourite is, but I do enjoy wearing them both a lot. And I love the matchy-and-yet-not concept.
Pattern: Calvin & Ripple socks by Cristi Brockway aka Turtlegirl
Yarn: Socks That Rock Mediumweight Rare Gem