One way to get your mind to break out of the mould is to force it to think differently. When I say differently I mean, not at all. To do this, I think of a word and then, taking the last letter of that word, think of a word starting with that letter. Oh, and the new word cannot end in the same letter it starts with. I do this 24 more times to see if I was able to use every single letter in the alphabet. Would be pretty amazing if I did, but some letters are just too obscure. From two minutes ago…
From there, try to use those words in an idea and convert them to some flash fiction.