What, nobody looks the UNSC Cruisers, the Halcyon-class and the Marathon-class? I certainly do, and the UNSC Destroyers too, along with most if not all the Covenant starships. It's all really great starship design, completely original.
I wouldn't say original, they borrow heavily from the movie Aliens. The Pelicans have alot of similarities to the Drop ship, the Pillar of Autumn looks a HELL of alot like the ship in that movie. Not to mention they both look like giant guns. Halo owes ALOT to Aliens, hell, just look at the Marines. That said, I fucking love both franchises and the Pillar of Autumn has a special place in my heart.