Use your games as source material.
Do you have any characters that either didn't get picked for a game, or the game you got into went kaput right away? Then you have a protagonist.
Steal plot from a module.
Pull out minis or character images and stare/mutter/shout madly at them until they reveal their secrets.
Write FR (or whatever) fanfiction.
The point is to write without worrying about whether it's good or original. It's to enjoy the craft of writing without allowing your filters to stop you. Will it suck? Oh yes, it will mightily suck, like a Hoover (either kind) made of a black hole. (Incidentally, if it doesn't, I hate you.) Ah, but there will be nuggets of awesome in your pile of manure. New ideas will come from the horse puckey splattered on the screen. Relax, have some fun, let your fingers be free, FREE!
And always remember: a gratuitous graphic sex scene can pad your numbers by as much as 2500 words! Or more! Wheeeeeeeeee!