Your stuff isn't that bad, although it appears to be obvious that you're still a beginner.

I'm not an expert at Bryce myself, but having read this thread I tested some of your uploads to see how your items would work. Hope you don't mind my suggestions below...

The space panels are very nice, for the most part. One would usually use symmetrical lattices for stuff like that to have a front and back side, but that's not something that necessarily matters. One thing I would have done differently, though, is the height of the panels. It may be a small thing and can be adjusted by anyone who knows about the Raise/Lower button in the Terrain Editor. If you reduce the height your panels really look much cooler. See the first example below, which is one of the panels I like very much.

This adjustment doesn't work well with all of your panels, however, because of the grayscale values you chose to create some of the patterns. Transitions could be more subtle in some places to allow for better adjustment.

There is one other thing that will present more of a problem. These panels are made for tiling, and the patterns do tile well. However, there are problems when moving the panels along an axis. For example, if you move one of your panels along the Z axis, it does not go where it should. This is due to the rotation values of your panels (I don't quite understand why they have these values). Again, see the examples below. The second image shows how I moved a copy of a panel along the Z axis. The panel should have been placed next to the first one, but hasn't. The third image shows the same movement along the Z axis after I corrected the rotation values the way they should be, and the panel moves correctly. See the rotation settings of your panels and the settings that will allow to move the panels correctly.

brainstew