Atomizer is used to spray liquids, so you can use it to dye, paint or varnish something.
Step 1: Setup
You need two drinking straws, one of them have to be wider than the other.
Use your Sugru to connect them by right-angle.
Step 2: Voilà
Here it is!
Dip the thinner straw into a cup of liquid and start blowing air into the other straw.