Free printable advent calendar of cone-shaped boxes with 3 different cone template options for a DIY advent boxes garland
(via DIY Rustic Advent Calendar Tree A Beautiful Mess
Calendrier de l'Avent DIY - Zü Free printable advent calendar (french and english versions).
Clothespin Advent Calendar from Sunday in Bed. This link contains several other DIY advent calendars instead.
Christmas Craft Project: Advent Calendar-- think I'll sew some small, reusable cloth bags, and find a slightly different way to arrange the clothes pins, so that there's more space for the bags. Love the idea of painting the clothes pins, though!