r.shade
Drapes a color raster over an shaded relief or aspect map. 
Raster (r.*)
ParameterRaster|shade|Name of shaded relief or aspect raster map|False
ParameterRaster|color|Name of raster to drape over relief raster map|False
ParameterNumber|brighten|Percent to brighten|-99|99|0|True
ParameterString|bgcolor|Color to use instead of NULL values. Either a standard color name, R:G:B triplet, or "none"|None|False|True
*ParameterBoolean|-c|Use colors from color tables for NULL values|False
OutputRaster|output|Shaded