[quote=@Intrepid]
<Snipped quote by Techspert>

The images are the art being used on the sleeves, the only alteration is a bit of cropping to fit them. And the image source was on Pinterest when I found it.
[/quote]

I think you'll be okay. Even if you do break ToS, they can't do anything about it after sending them to you and they can't keep your money. They won't check, it's not against the law, and the worst thing that can happen is "Refund or choose another." But as long as the Pinterest post wasn't selling their art as art itself, you shouldn't have a problem.