Hopscotch has a 25-minute tutorial on how to learn the basics of coding.
Scratch is proposing coding a holiday card for Hour of Code:
http://scratched.media.mit.edu/resources#!
Some people did hour of code without a computer. Some with paper only, others with plastic cups.
http://instagram.com/p/hjYbk4Cmwq/
Brainpop even has a webinar on how to get ready for Hour of Code.
For more ideas, you can consult Twitter at the Hashtag
#HourofCode