You will need:
Any boring ceiling fan.
Some glow-in-the-dark paint, or glow-tape.
Something to clean the blades off with
A phillips screwdriver
Step 1: Remove the Blades
So first we remove the fan blades. Sometimes there is a twist-type screw which holds the blade in place, but usually there are 3 phillips screws.
Step 2: Clean the Blades
Step 3: Tape Guides
You will want these lines to be precisely the same distance from the edges of the blades, and as parallel as possible, otherwise your circle will end up very blurry.
Should you have access to some glow-tape then you won't have to worry about this. But alas, my city is too cool for glow-tape, and I'm far to impatient to order some. Since this ancient bottle of glow-paint still works, glow-paint it shall be...
One advantage of paint though, is that you can find it in many colors, including blue. You could mix the blue and green colors to reach the 'Tron teal' which is a surprisingly nice looking neon color. Again, I'm too impatient to order some blue glow-paint, so here we go with green...
Step 4: Paint the Blades
This is when you should make sure your wife is otherwise detained. Should she find you painting the fan-blades at this point, she will not understand the awesomeness that you are trying to create.
Once you are done painting, allow an extra amount of time for this to dry, or you will end up with a glowing ring around your walls... Which may be a cool thing, I don't know.... Maybe next time.
Step 5: Re-install
You are done!
Notice the glow-paint on white is barely visible, thus the fan looks fairly normal during the day, and nobody is the wiser.... until the lights are out.
My camera doesn't really do this justice. Having a black-light in the room keeps the glow-paint charged indefinitely, so the effect doesn't fade. And of course, keeping the fan at the highest speed is best for the consistency of the circles.
Should you need to, the glow-paint is very easy to rub off of the fan blades (or most other surfaces). Otherwise, you can enjoy glowing fan-blades for many years to come, no batteries required.