1.  In your paint program, make the letter U using the arial font.  Flip it upside down, and saved it as a bitmap (bmp) size 512 x 512. (background in Black and letter in white)

 

 

2.  Open Bryce.  Select the 
Symetrical Lattice

You'll have this in your scene.

click the Edit area

           

..then click the Terrain Editor Icon  

 

to take you here

click the check mark in the bottom right corner to go back to our image.

Rotate and resize to your liking.....see it in the preview window

 

 

Click the "M" to
edit the materials
in the Materials Lab