I enjoy being trendy, so I'm all for leitmotifs du jour. Sometimes I'll think a nod is enough, sometimes more.
The owl has hit mass scale. CVS pharmacy is selling glass owl x-mas decor this year. That's an interesting one for me, because the owl is almost a personal motif for me - my high school mascot, my friend who's convinced I love owls because we had our picture taken with (live) birds once and I carried the owl... and there was my owl sweater from 15 years ago. On the other hand, I'm really not that into owls.
I see Native American patterns have been and still are going fairly strong among the young (Tilly's, Urban Outfitters, etc.).
Sugar skulls are a motif in my hipster neighborhood in particular. Sort of a sign of the place.