Advent calendar activities over at Motley Moms. Go check it out!
In the meantime, I've seen some really cute ideas for creating your own Advent calendar. You can use mini galvanized buckets, numbered 1 - 24 to hide little treats in. Hang them on a ribbon or cord to create a garland. You can even hang them out of order so the kids have to search for each day's treat.
Another cute idea is to use mittens (use mismatched or find them at thrift stores). Add numbers using felt or stitch them on and hang on ribbon or cord.
I found some really cute examples online by searching for "bucket advent calendar" and "mitten advent garland"...there are lots of ideas out there, both simple and elaborate. Have fun!