Hey, sorry i didn't respond.
The way i make my covers is well...i either ask a person to do them, Ezmeralde is who i usually ask. She's amazing :) But i've used her for only two of my covers. She created the covers for Flyers and then The Boy in the Baseball Cap.
For all my other ones i go onto Google Images and search for something that is relevant to my story, copy it onto Paint.Net (a more advanced version of Paint, a *little* like photoshop tho not really) then i change the dimensions to 256x400 and if i need to i mess with the coloring and all that jazz and add a title :)