Photographers use Star Filters sometimes to really make the highlights stand out, but if you do not have one you can use GIMP to reproduce the effect.
Star Filter Effect in GIMP
If you don’t have a zoom lens or you’d like to manipulate a certain image in this style then this tutorial for GIMP should help you achieve a similar effect!
The final result!
In this tutorial, I will show you how so improve boring text with some simple lighting. I used GIMP to produce this effect.