In 2010 when I was overflowing with excitement about an upcoming trip to Disney, I made this countdown (
here's a blog post about it).
I used a Mickey head punch on some red and black cardstock I had sitting around. The fist few ones were all red until I realized I just wanted to do the 5s and 0s in red. It helped get a sense of the days visually. I used my favorite white pen to write the numbers and put a ring binder through holes I punched. I hung it on the fridge and my DD and I pulled off a head a day until there were none!