BURP stands for Big Ugly Rock Piece.
See also: 6083 - LURP
Click on a colored part below to see the Sets and MOCs that use part 6082 Rock Panel Rectangular 4 x 10 x 6 (aka BURP) in that color. You can find an overview of all LEGO Colors here.
If a color is missing, it probably needs to be added to a Set Inventory.