It's quite simple, actually, to add some special effects
to an image with Photoshop, or similar 2D app :)
The basic principle is this:
If you draw a line, stamp a brush or such on a new layer,
then add an outer glow, you can make an interesting effect
You can find brushes just for such use on the Net, in the
demonstration pics below I've blurred them a bit to protect
the brush maker's work, by the way.
You can get swirls, stars and all kinds. You could also
use paths to create your own designs, and use "Stroke
with brush" to paint them in with white (the strongest
easiest colour to work with for such).
Other possible techniques are instead, to fill a layer
with a gradient, use a design as a mask to cut it out leaving
a cool looking effect behind.
Note that by adjusting the layer type, from Screen, to
Multiply etc, you can get other looks.
Also, when I rendered the staff, I put a small light inside
it with a custom lens flare inside it, to make it glow,
very useful tip for general 3D work when wanting such items
to look lit up.