Yeah the Chaotix cover had 2 things going for it, one that it's already intentionally blurry so a little more doesn't hurt it, and two, the white background meant I didn't have to stretch it as much, just cut it out.
The Kolibri yeah.... the original was 640x869, I'm surprised I managed to get it to look presentable at all. Still if you really want to complete your collection, or want to put your 32x games into plastic cases those aren't a bad way to go. I printed that 250 dpi Kolibri one out and it looks decent, actually looks better than some official SMS covers hahaha. But I know you guys are perfectionists here, and I respect that.
I'd love to update the Kolibri pic if I could find a better scan. Maybe one will surface at some point.