A nice trick to make the right color is to make a new image in your 2D-editor just with the colors you'd like to see on the bricks. You can just pick the colors you want with a standard color-picking tool, take a brush and paint. The brightness doesn't matter, the only important things are the hue and the saturation. Then you copy this colormap and paste it as a new layer over the original brick-texture and you set the colormap-layer to color mode (you could also make 2 colormap layers with seperate modes for hue and saturation). You can play with the settings for the right color-transfer to your original brick-texture. If neccesary you can make a mask for extra color-blending flexibility. Then you save this newly colored texture and open it in Bryce.

(_/)
(='.'=)
(")(")This is Bunny. Copy and paste bunny into your signature to help him gain world domination.