Kaboose has a cute craft idea whe you can make a mini nina, pinta and santa maria using an egg carton to celebrate Columbus day.
Good for ages 6 and up.
Get the instructions here:
http://crafts.kaboose.com/egg-cup-ships.html
Chronicle books uses walnuts and candle wax for the base of their ships.
Get the instructions here:
http://www.chroniclebooks.com/blog/2010/09/30/chronicle-craft-columbus-day-craft/