I'm a geek. I dressed up to see Harry Potter and the Deathly Hallows (Part 1). I brought along my trusty verson of the Elder Wand (one of the three Deathly Hallows themselves!) Here's how I made it, so you can have your own as well!
Begin with a 14" dowel (I used a 1/4" diameter)
Attach a small ball of polymer clay approximately every 2 inches. Make one end ball slightly smaller, and use the removed clay to enlarge the ball second from the other end. Use a ball-ended tool to create indentations in each ball to add texture. Add a glob of clay to one end. Stand the wand upright to flatten this glob of clay. Again using the ball-end tool, draw a line downward from where the clay attaches, increasing pressure as you go down to create a decorative texture. Bake according to the clay's instructions.
I suggest making two small stands and using those to hold the wand sideways to bake.
Sand thoroughly and sand extra on the unadorned end to create a slight taper. Add a base coat of off-white or cream colored paint. Add a second coat if needed.
Create a wash of dark brown paint, 2 parts water to one part paint. Paint the whole wand, allowing the paint to pool in each indentation. Paint a silver band two balls from the base end to serve as a handle. Coat the entire wand with a gloss coating.
There you have it! Your very own Elder Wand! 14", Elder, with a Thestral Tail Hair core.