Like the input we have going everyone. Thanks from me

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I like the idea of cut to fit black felt as do I like some simple coloured sheets of card. I'd just be constantly changing the colour sheets as some characters like Jack Sparrow would be a hard fit. Blue for the sea, green for land, white/red for sails....

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Think I personally may try for atleast 1 case (I have 4) to get a cut to fit sheet of felt , unsure about the shelves themselves as that would block the light gained from upper strips.
Then at the centre of each backing just above head hight cut out logos relevant to the characters displayed. A silver Batman symbol for my Joker and Batman, A few controllers for the game characters, or even just the official movie logos.
No doubt though that I will never be satisfied and will continue to try different ideas. I have a wild imagination that will always say "well batman could have a city scape behind him, or the Batcave, or as he is with Joker a street with the bike in the image". Then it will move onto things like a dio of all the above, or maybe a small official poster print, maybe an autograph, a simple artsy outline sketch .......I could go on and on and on. Delusions of grandeur.
Just need to find somewhere in this dead end town that will sell a cut bolt of felt and not at the cost of a new case. Would not trust my arthritic hands to cut straight nor my memory to get the measurements right.
Keep em coming ladies and gents, hopefully an idea will stick and be a perfect fit for me..... you can help others but this is now my thread. Mwhahahaha