All it takes is some pretty patterned paper and Mod Podge to DIY cheap tiles into coasters. You can make them with holiday patterns or something more personalized to the coworker. Get the tutorial at Boxy Colonial.
What cute hexagons! Hexie quilts and tutorials are great for almost any house. Make a quilt, a blanket, a mug rug, a table runner . you can't go wrong with hexies! Christmas themed fabric shown in tutorial