Aye thank you mate~ I use several different apps to edit them my covers.
Faded, which is $2 (shh don't tell my parents)
Instaeditor, which is free.
And Knockout, which is also free. For the Please [Don't] Believe Me cover, I found a picture I liked and ran it through the Faded app and added the text in Instaeditor.
~Mod Dan~