I have an assortment of spacecraft miniatures I've gathered over the years, from Star Trek (Star Fleet Battles, FASA's Spaceship Tactical Simulator) and I use the Klingon ships the most, Babylon 5 (hmm, maybe it's time for the Shadows to make an appearance today...), Battlestar Galactica, Traveller (although only civilian ships so only use those when making a "ragtag" fleet

), Silent Death, Full Thrust, to Star Wars plastics which need to be rebased to use on a hex grid. I have used my Italian WW2 naval vessels at times (only time I get to use them, no one is playing naval games around here).