I applied last year straight from my undergrad program with no publishing under my belt. I applied to 4 programs and was admitted to two of them with 50% funding to both. I wanted to go to Pratt Institute, but it was out of my price range. I deferred, just in case I want to take out 40k in loans. This year I am going the fully funded route and it seems the programs place less weight on publications and more on your ability to teach.
I just submitted to the University of AZ (fully funded) and they specifically asked you to write about your experience in the classroom. However, they also made sure to note that it was okay if you didn't have any and they were trying to gauge what resources the incoming cohort may need in that department. It really depends on the program, but more than anything the quality of your portfolio is the key.
edit: I should also have mentioned that I graduated a year early from my undergrad program and started applying when I was 20.