There are huge advantages to actually modeling the bricks instead of just using a material. One of the biggest is that the bricks will actually cast shadows and produce far superior results when close ups of the wall are done.
This a quick tutorial on lighting in Bryce. It starts with the light setup we created using the settings from the default lights in Poser. It's not a definitive guide and is certainly not very detailed. However, we hope it gets you started on using lighting successfully in Bryce to simulate radiosity and soft shadows.