I am already restraining myself from breaking into my advent calendar (bought at the beginning of the month by Mr B’s mum) which is a classic Dairy Milk calendar.
This is a cool crafty fabric advent calendar at alittlewonky which could be easily customisable depending on what fabrics you had.
An easy budget envelope Advent Calendar can also be seen here on Flickr (ziggiau) which I may try and do next year, saving up all my coloured envelopes that I get throughout 2o12!
Thanks to The Crafty Crow which had these two (plus more!) calendars on.