Low-budget sci-fi is inspiring because it always gives me a "hey, I can make that" feeling. I've worked on some low-budget sci-fi and it's fun as hell. You got people walking around the set with giant bubble-heads made of foam latex, and six arms, and locations like Mono Lake after a freak snowstorm. If you're lucky, a producer will be able to book William Sanderson for a walk-on part, and you'll get to feed him his complex and nonsensical scientific-jargon lines. I'm telling you, low-budget sci-fi is some of the best times I've ever had.
With that in mind, here's some classic sci-fi trailers. Study the aliens, monsters and spacemen closely. There's nothing here that you couldn't create with a few odds and ends from the back of your closet, Wal-Mart, and that collection of cardboard in the garage. Stock up on some duct tape and bathing caps and you'll be set for any costume party, trick-or-treat scenario, or film shoot. Have a blast. We only get one go-around in life. Spend some of your time on Earth as a Mysterian.
This Island Earth - 2 1/2 Years In The Making!
The Mysterians - Love-hungry spacemen come to seize our woman, that their dying race may live!
KRONOS - A Metallic Vampire, Stalking The Earth!
Journey to the Seventh Planet - Starring John Agar and Greta Thyssen. And some poor guy yelling (I think), "Augh! AAAAAUUUUGHHHHH!!!"