This last week was Brayden's birthday. My Mom was over helping Brayden decorate for his party (he loves to put 2 foot sections of crepe paper all over the house). She put this giant letter "B" on the window. I thought that was fun, but didn't think much more of it.
I left it up, and started noticing how enthralled McKenna was with the giant letters on our window. It struck me that this is a great idea for something fun and different when teaching a specific letter! So if you do a letter of the day/week/month/whatever, you could put a large letter out of crepe paper up.
It is fun and interesting because it is different. It is attention getting. I think this is especially effective for the two year old who is very interested in letters and just learning to identify them. McKenna talks about these large letters every time she sees them.