Greek key: one of my favorite trendy patterns right now. Jonathan Adler is the master of the greek key pattern and incorporates it in many of his products (two of which are below). I love the versatility of the design: it can be both bold and subtle depending on how you use it. Greek key works great on accent pieces as well as large statement rugs, wallpaper or even tile!
A few of my favorites: pillow, wallpaper, vintage glasses, bathroom tile, and rug.