This is one of my resource files I've decided to share. It's a Star Trek Phaserbeam FX I've created a while ago in Photoshop and which I have used in several of my images so far (see below of a few examples).
The file available here is a layered PSD with the single beam on a separate layer, so you can easiy copy and paste it into your work, angle it as necessary, adjust the perspective or/and add additional effects.
All I ask is that you include "Phaserbeam(s) by overseer.deviantart.com" into the credits of the picture you create. I have no problem with this resource being used on or off deviantART, providing the credits are shown as stated.
You're also welcome to change "Phaserbeam" to "energy beam" or whatever. You may of course change the hue, saturation, use it for something non-Trek, basically use it for whatever you need, as long as you provide credits on your creation and a link back to my profile page.