Several people have thought the idea of a ship set based on Aliens would be cool if it had enough ships.
The solution is to mix similar looking ship styles from three different sources. This should give enough ships for a set.
They are SAAB, Aliens, and Starship Troopers (Both movie and cgi series).
The Saratoga, Nostromo, Sulaco, Rodger Young, Hammerheads, Cheyenne Dropships, ISSCVs, Various groundtroops, and many others.
Someone has already posted the Saratoga and Hammerhead.
Lots of Online sources.
I for one would love to see it.