I've only found the skull on the first and last level. I can't find any others, some help would be nice.
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I don't know where exactly they are, but I do know that we have a wonderful guide to Halo 3 explaining where all the hidden skulls are. Just go to the Expert Guides tab, and scroll down to find Halo 3. We also have videos showing them in much more detail.
On the 5th level at the start when you first see the flood jump across he roof kill them and one of them drop a skull.
On the last level at the start when you go through the cave there is a cave going left or right I think it's left go down it to the end.
On the 7th level fly to the middle tower and keep looking around there.
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