These look like a lot of fun, and might be just the gift you're looking for next month. The Wolfelele Ukelele (sic) Company offers kits for several triangular uke models. Wolfelele claims that the ukes can be built in about 30 minutes. Their site features materials for teachers and festival organizers who'd like to offer ukulele building activities.
Shown here is a soprano model, which sells for $49 Canadian.