Just think of an object in this world that could be better, figure out how it'd work, what would be improved, and the drawbacks of the improvement, then incorporate them into a drawing.
ie. a futuristic car: Is solar powered and has turbine jet engine thingys on the side, making it cleaner and faster. Unfortunately, it would be very large.
Now draw it.
Or you could just draw inspiration from other things.
Do you like shadow of the colossus? Draw a giant.
Like King Arthur? Draw some knights.
Don't blatantly copy or take an unoriginal character, just draw inspiration and perhaps borrow different elements of the character/world into your own creation.
I like to draw a squiggly line on some paper (one that doesn't cross itself) and turn it into a section of outline. Then I just add the rest of the outline and fill it in with what I think it looks like.
People are just a matter of getting a good pose and having slight knowledge of anatomy. Try drawing a tree...yeah, just a tree. I find trees quite fun to draw. Which reminds me I haven't pixeled one yet...Mmmm...