I think a lot of us think of idea generation as separate from creating, and that in order to create, we need a good idea to execute on. I try to remember that creating is actually a mode of idea generation, that sometimes sitting down to make things opens our brains to inspiration instead of the other way around.
So I think the thing is just to make time and space to get into a focused state to make things — and specifically to make BAD things without having a plan or a great idea beforehand.