Open console (~ or ').
Type player.additem ItemCodeHere #
# = Quantity of item you want.

ItemCode = Codes listed below.

Code - Effect
Blind Watcher's Eye - 0004340E
Deformed Swamp Tentacle - 00043410
Pelvis of Pelagius - 0006D0F3
Sheogorath-Shaped Amber - 00078977
Two-Headed Coin - 00081E5E
Soul Tomato - 00081E60
Din's Ashes - 00081E61
Hound's Tooth Key - 00081E63
Dagger of Friendship - 00081E65
Ring of Disrobing - 00081E68
Mixing Bowl - 00081E6E
Mute Screaming Maw - 00081E9A