How can you not know how to deco for an orc? all you have to do is throw gore tiles and bone piles and skulls and weapons around everywhere.
Here are some ideas if you want them.
Surgical room
Wolf Pit
Note that there are no guard rails so when someone comes up the steps they fall in
at pit level
Volcano Cave
Hidden Fort
note the bard skeleton, backpack and what's in both
Pay attention to detail, it makes it much more evil: The bard has 3 arrows in his corpse, note where they're placed: forehead, neck, heart. His skin was flayed off (the hides) but there's no meat as it was eaten.
Outside of the house
Orc (mage) Fort
1st floor
Second Floor
Outside view
Tragic Remains of Travesty are great as you can dye them red like blood with a reward statuette dye tub, and they make death sounds.
Experiment with the corpse parts, you can get alot of them to fit together to make it more realistic
go to the "dark and dismal" section
Note the 3 corpses design, the "tub of blood" design,
and the "Eerie Stand," but instead of bolas, use a brasier for the base, a wooden shield for the table head and keep the 3 skulls
Need anything else just ask