My favorite individual LEGO UCS themes:
ST04 VENATOR Star Destroyer
by Anio
ST12 AT-AT Walker
by Anio
EF76 NEBULON-B escort frigate
by Dranac
Mon Calamari MC80 HOME ONE
by Baciccia
Mon Calamari MC80 LIBERTY
by Baciccia
UT-60D U-WING Starfighter
by StarBricks
Kylo Ren's TIE SILENCER
by StarBricks
RESISTANCE BOMBER
by StarBricks
OPEE Sea Killer
by Pepa Quin (Matt De Lanoy)
XD-1 DISCOVERY ONE
by Jason Allemann
ALEXEI LEONOV
by Jason Allemann
Alien CHESTBURSTER
by Arvo Brothers
Alien FACEHUGGER
by Xenomorph
Alien USS SULACO
by Shannon Sproule
PREDATOR Bust
by Shawn Snyder
TERMINATOR T-800 Bust
by Martin Latta