Depending on what you are wanting to stack I would use long wooden skewers or long lollipops. You would want thicker sticks to hold heavy objects. The heavier the object on top the thicker diameter of stick you would need. It also depends on whether the object has to be edible in the end. If not wire wrapped and twisted together can be strong but you would need a very thick guage to be stable. Generally wire is best for arms etc where lots of weight is not place on it.
Miranda, Rocket Cakes, https://www.facebook.com/pages/Rocket-Cakes/389591004470910
