By the way, if you'd like any help with programming or design on these let me know and I can be of help.
Hey there! Glad you like it

I have a few ideas for further theming. Maybe I'll come back on your offer

Apart from that. Of course it is possible to mask the cartridges so that they can change. Problem with this is that one would have to use the exact same set of cartridges so that they align properly with the mask image. I will try the next weeks what I can do.
And of course there will be more themes in that style for the other handhelds. I was just busy with setting up my htpc with launch box so I didn't create new themes for attract mode. And since there isnt that much of action I forgot about these

Which handheld shall I do next?