First I will show you the tools that we're going to be using, which we will need the Gradient Tool, and the Pen Tool.
Step 1: Selecting and using your Gradient
For this instructable I choose a deep purple blue fading to a blue teal.
Start from bottom to top with your Gradient, and as long as you HOLD SHIFT the Gradient will stay straight all the way up the page.
Step 2: Creating a selection with the Pen Tool
With the Pen Tool, a single click will make a point, but if you click and drag the Pen Tool then creates curves on the points.
Step 3: Creating your Aura Gradient
When ever in doubt of what you're doing, make a layer for it. It's alot easier to delete a layer and start where it left off, rather delete the whole picture because you didn't make layers.
For the Aura Gradient, I'm picking white which seems to turn out pretty well. You can pick any physcdelic color you want for your gradient, mix and match, have fun with it.