I really like the idea of the Advent wreath which is assembled from tea glasses :)
Links:
Advent Wreath in Glasses (Adventkranz in 10 Gefäßen) (German)
Google translation of the article
If you want to know more about Advent wreaths in Germany and perhaps even want to make one yourself, check out Christmas Craft Projects – Advent Wreath and How to Make Natural Green Wreaths on the same site.