If you like nostalgia, go for some 50's stuff. Especially artwork inspired by sc-fi or the space race.
There is a whole science to it, something I have a grasp of, but no education to back me up.
So I hired someone to do mine.
I still had to offer ideas or creative inspiration so the artist could throw some proposals, but it's best to get some help.
Do this. Go to your DVD/BluRay collection. if you don't have one, go to best buy, fry's, etc. Look carefully at the cover art and why they chose it. What you want to do is establish a working theme, and why it suits you.
if you find something that grabs your attention, rent it, buy it, whatever...take a look at the opening credits and listen to the theme music. Get immersed.
I think this is easier for the first step. It's too easy to get lost in browsing other logos when needing inspiration.