Found a wiki page that hosts a ton of top down pictures of home world ships link below.
http://homeworld.wikia.com/wiki/Category:Homeworld:_Ships
http://homeworld.wikia.com/wiki/Category:Homeworld_2:_Hiigaran_Ships
I also found some other images that are pretty good
Pegasus class supercruiser
Hiigaran destroyer ii
I know that theses ships are not in home world by default and are in fact mods for homeworld. However I thought that they were really cool.