The Stylize section of effects gives you many different ways to stylize your image with effects such as Crystalize…, Pixelate..., Snow…, Vintage…, and many others. Here is an overview of the different filters you have in the stylize section and what they do:
Crystallize: This effect will create polygon-shaped color blocks
Pixelate: This will create a pixelated effect for the image that you can increase the intensity of to make it look like a retro, 8-bit type of image
Twilight: This effect will darken the image, and based on the intensity you select, can create a very soft and dark image
Fog: This effect will soften the image and give an overall glow
Gloom: This will soften only the highlight areas of your photo