This is a fun way my kids learned to tell time (we've had it up for a few years now). All it takes is a clock, large embroidery hoop (mine is 18"), 12 clothespins, and cards. Instructions can be found on Martha Stewart for pinup wreath.
This helped so much when Cole and Sarah were little. Now, it helps reinforce the multiples of five.
At Christmastime, it serves the purpose of hanging cards nicely.