@soundwave925 - Sure, send me those scans. How about on the generic PS1 inlays on the left it's white with
this PS1 logo? (I'm just saying white because it would save ink)
I've never had any Dreamcast games, but I'll go off of what you send me. Maybe it would be similar, with the Dreamcast logo on the side?
And for games that do have interior art, I can definitely make some, just send me what art you want. I'm sure I could throw together some inserts for the Sega CD, Saturn and Dreamcast Sonic games in particular.

@Velmeran - Thanks! You can always download those images and pop them into Imandix and see how they look next to your other covers. By the way, is there some way you can send me the preset in Imandix so that I can make previews? I might be using a very old version, but I can't figure out where to set up a new box size.