I do experience this problem; it usually happens when I get a “bug” (a strong urge to write something creative). I want to write something, I have to write something, but I can’t write something because absolutely nothing is coming! It’s really annoying. I came up with a method once to get creative ideas flowing, and (at least the first time I used it) it actually worked (I haven’t used it much though, so I don’t know how helpful it really is.)
I think a bigger problem for me than turning my creativity on is turning it off. Sometimes it’s almost impossible for me to get the “plot bunnies” (BTW, I’ve never heard that term before, but I like it a lot!) from jumping around in my head. It’s hard to deal with because most of the time I’m trying to focus on something else, like homework or listening to someone. Does this happen to you too?
To the glory of God and for the advancement of His kingdom.