In Legend of Grimrock, there are several hidden locations. You can find various items in these secret rooms (weapons, armor, etc.).
The one that's piqued my interest the most, however, is the Skull.
Normally, I'd think nothing of this. Just a skull in a pile of bones. Seems to be fairly common in dungeons like these. The confusing part is: They get their own section in the Statistics page.
Do these skulls do anything for me? (i.e. will collecting ALL the skulls get me a super-secret ending and/or weapon?)