I would also check out Pinterest. They have a ton of ideas if you type in Christmas Snacks. Two that I saw that were easy and cute were applesauce cups with holiday cutouts to cover the tops and little Baby Bell cheeses (in the red wax) that had paper wrapped around them to look like Santa's belt. I also saw cute small donuts that had a red candy tucked in the hole with broken pretzel antlers. Trust me, once you start looking you'll have more ideas than you know what to do with!!
Re: Healthy Christmas Snacks
Green grapes & red berries
Christmas shaped pretzels or holiday crackers
Cheese cut into Christmas shapes/mini sandwiches cut into Christmas shapes
"Trail mix" with Christmas colors
Mini frozen waffles or similar with cinnamon cream cheese?
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I love these two beautiful children!
open faced sandwich-mini bagels with green cream cheese and crasins...looks like little mini wreaths