In my mind there are very few patterns that stand the test of time in the design. Greek Key is up there in my top 5 favorite timeless, design patterns.
Although, it has a very repetitive simple geometric pattern it is anything but boring. This key symbol was very important in Greece because it identified infinity, unity, bonds of friendship, of love and devotion and that's the reason it's often given as marriage gift.
I personally love using it as an accent trim (pillows, window panels, bed linens, lamp shades...) Pretty much anything looks good in/with greek key and if you don't believe me, just look below::
What is one of your most favorite timeless design patterns?