1
Create a new image, and in the Layers window, make a new
layer.

Now, in the Photoshop tools bar, use theRectangular Marquee tool.

Make one thin selection spanning from the top of your image to the bottom. Then, holding down Shift, draw a few more vertical selections spanning from the top to the bottom of the image.

2
Now, select an appropriate foreground color for your starburst.
Fill the selection, by pressing Alt+Backspace, on the keyboard.

Deselect, by pressing Ctrl+D.

3
In the menu select:

Filter > Distort > Polar Coordinates...
Polar to Rectangular

Really simple... Theres tons of em out there