Attached Link: http://www.horo.ch

Bryce 6.1 comes with a tutorial (much to my surprise) about how to make a Bryce IBL compatible Sky Dome HDRI in Bryce itself. I was encouraged to make the other two I had in mind when I submitted the first one and never got an answer from DAZ3D. They are now available as "How to create a Mirror Ball HDRI in Bryce" and "How to create a Cube HDRI in Bryce" if anyone is interested. You find them at http://www.horo.ch > Raytracing > Tutorials > Bryce-HDRI.