Walk through any craft store right now and you'll see one embellishment factoring into 90% of winter decorations: glitter. Yes, glitter. The material that never comes off your floor and clings to your skin like a parasite is even bigger this year than it was last year.
What does that mean for your shop? Go shiny or go home. Include metallic thread into your winter crochet. Add some iridescent glitter to snow in your craft scenes or ceramics. Choose those beastly fabrics with the shiny flecks woven throughout for accents in your sewing projects. Add glittery accents to your screen-printed clothing and accessories. If you can feasibly add shine, do it.