1) Two older women (Lauri Guzda and Mami Kimura) mud wrestle in a pile of black mud on the floor of a while room, in the official music video to the song "Can I Go On" by Sleater-Kinney:
2) In the official music video (made by Jason Kraynek) to the song "The Golem" by the duo called "[melter]", Robert Hyman and Nadia Garofalo perform the song in a dark room, while being completely covered in gray mud:
3) In an official music video (the one made by Vice Cooler) to the song "Mud" by Peaches, a woman gets gunged with mud in reverse, Peaches (Merrill Nisker) gets gunged with mud, sprinkled with dirt and flour, and splashed with red juice - all in reverse, while other women and men, all covered in mud, dance in the background: