Dan, in 5.5 some later filters work too. Alien Skin Eye Candy Texture and Nature (ECT and ECN 5) work. Then Xenofex 2.12. Flaming Pear India Ink works. I still haven't got my various filters installed, but I suspect the Flaming Pear free plugins might work. Of Photoshop 7 native filters, only Blur (Gaussian and Smart blur) and Sharpen (Unsharp mask only) worked. Other blur and Sharpen filters weren't present in the menu. The other filters refused to work, while Render -> Clouds crashed Bryce. And a photographic filter I have, Panopticum Lens Pro, caused Bryce to simply disappear. IE, to crash, but without the error report and stuff.

-- erlik