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Anti-Matter
This filter inverts a selection's brightness without affecting hue and saturation values. Although Eye Candy suggest this effect provides a quick way to invert a graphic for a Javascript mouseover I see this filter being used in a more limited way to create weird image negative effects.

Anti-matter filter

Bevel Boss
This filter applies a number of bevel and /or carve shapes. In the Bevel Profile Tab you can edit the shape of the bevel and save them for future use. You can control smoothness, direction, inclination, highlighting and shadow colors. I found this to be a better tool than the limited ones in Photoshop.

Bevel Boss filter

Chrome
Creating a chrome effect can be done in Photoshop but it is constructed by initiating a number of steps and the results are not always satisfactory. The chrome filter uses reflection maps to create a number of realistic metallic effects, including gold, silver, copper and chrome. You can only use this filter with RGB and grayscale images. This filter also has commands for adding bevels to images.

Chrome filter

Corona
The Corona filter quickly creates solar flares, gaseous clouds like nebulas and other astronomical effects. You have control over glow width, flare size, stretch, waver, blur and opacity. The filter can affect outside the selection or radiate from it. There is also a random seed generator. It would be nice if you could use gradients as well as single colors.