Um I'm pretty sure those covers are also from a decade ago.
Its ok that you are new and want some help, but not taking the advice of some of the other members is pretty lame.
All I am saying is...

But smoothin, I did read your response, and it has nothing helpful to say
I hear you cry.
Might have some luck searching the forums with the search bar on the top of the page.
lenoxseer's Treasure of the Deep DVD case is right there on the first search result.
ConstructivelyDo you happen to have any of these games strategy guides? The dimensions of a strategy guide closer resembles the front of a DVD case (be it, rectangular). Only problem with strategy guides in order to create a cover is unwanted wordings

Otherwise, if you hate the idea of having black bars on the front of a case, the only other solution for retail artwork is to stretch (and nobody wants to do that and proudly show off their work).

We don't know the style you are looking for (completely custom / partly custom / as retail as you can get it). Pictures help on what you are looking for. Using the search function on the forums as well will also net you results (as it is not tied to the main site).
This is not towards you, but I would LOVE to know the context behind PS1 DVD styled cases...
Personally, I see little to no reward to converting my PS1 collection to DVD styled cases. I would have to store the original jewel case and artwork, but also have a separate case altogether (that is larger than the jewel case) to hold the game. If I then buy 15 more PS1 games next week, do I... come back here and request 15 more cases for each of those games? What if you happen to find 100 games this week for a steal.
Practically you are taking this [75 games with TONS of vertical space]

Going to this ultimately store the cases away


To then swap to this [53 games]

I've done this in the past, converting PS2 games into Slim-Line cases. About 3 years after I did that, I hated myself for doing it. Such the waste. I'm down to these games left to recover

But again, that's just what I've done and my opinion.

I mean... more power to you... but I can tell you that a majority of the contributors here... won't do this... and seeing that they won't do this, there is no reason for them to make a DVD styled case, seeing that they know if they purchase another CD jewel case game, they will ultimately have to generate another DVD styled case. Which is, to me, stupid.
But again, that's just my opinion,
but I've seen way too many of these DVD styled PS1 posts never get fulfilled. Figured I would let you know sooner than later.