That is what you need: plasticine...
...acrylic paints (black, white, orange and yellow)...
...And hot glue.
Add a plasticine to your pen. Form it like you want. This is a handle.
Add a little bit thinner cover of plasticine. That'll be odds of wood.
Add some hot glue in Your favourite shape (spirals, dots etc.).
Now take a paintbrush.
And colour Your wand by a mix of acrylic colours. My is defying now :) When Your wand is ready, leave it for few hours.
And that's the pen-wand! You can cover it by varnish if you want it to shine. Enjoy :)