Okay so these puzzles aren't exactly mentally challenging or anything, but aren't they precious? Excellent shelf decorations.
Available at: Little Goodall http://www.etsy.com/listing/57910243/fantastic-little-fox-coat ($150)
Available at: Kitty Baby Love http://kittybabylove.com/index.php?main_page=index&cPath=1&zenid=0075e3b9a641dab649c1d1549f0d9dc6 ($3 each)
If the kids table at my Christmas dinner this year had a kit this fun, I'd be half tempted to join them! Free free free printable activity kit to keep the kiddos busy.
Every day has a dot, by the end of the month you have a cute, blocky critter!