Finally Trying My Hand at Clop. Cover Art Needed

So, I caught wind of Dirty Little Secret's Dirty Little Contest and figured it was just the push I needed to try writing an actual clopfic. It will, of course, be an absolutely ridiculous comedy.

Description: To win back her honor and the Crown of the Sibling Supreme, Twilight acquires a dick and challenges a very confused Shining Armor to a "sword fight". Things get weird from there.

Contains: Futa Twilight, incest, "sword fighting", impreg, urethral unbirthing, possible noncon? (remains to be seen. So far, Shining is not terribly enthused about all this).

I can handle the writing part, but what I'm really gonna get stuck on is what to use as a cover image. I usually just grab and crop a screenshot for my cover images, but I don't think that'll work as well here. Proper Clopfics almost always seem to have a cover image that looks like it was specially made for it. I have zero non-writing artistic talent, so if anybody out there can rustle me up a pic that fits well with that description and still conforms to site rules, I'd be most grateful.