first open photoshop and make a new file. make the backround black any way you want. (or any other color) go to filter>Render>Lens Flare. a box should show up and with the default settings in tact, (or not,) click 'ok'. you should have this...
step 2 of 3
Now go to, Filter>Distort>polar Coordinances. select polar to rectangular and then click ok. then go to Image>Image Rotation>180(Degrees) you should have this...
step 3 of 3
im Sorry, i made a mistake in the rotation, your's should be upside down, opposite of mine. now repeat the steps above from step 1-2 but when you do polar coordinantes, click the other box. play around with the hue and saturation, shape and backround to get one you like. thank you