Create a new image, and in the Layers window, make a new
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.
Now, select an appropriate foreground color for your starburst.
Fill the selection, by pressing Alt+Backspace, on the keyboard.
Deselect, by pressing Ctrl+D.
In the menu select:
Filter > Distort > Polar Coordinates...
Polar to Rectangular
Really simple... Theres tons of em out there