Is there any chance of having any other background colours except jet black? It would be nice to have the option to have the background a different colour - Like grey, blue, white, etc.
At Present time, no, and here's why
the Mobile versions are prerecorded movie files, that are streamed to your device.
They are not Cutout Animations, like the Desk top version uses.
Since they are preRecorded, the background you see is part of the recorded video,
It's not a replaceable background with a cutout model over top of it.
HTH
It may be possible;e later down the road, but it would mean a re-recording of every clip released so far.
to do it, the recorded video would need to include an exact copy of the same video to be used as a mask.
so the size of the file would be double, and the Bandwidth needed would also be doubled.
Also a client side script would be needed to replace the mask with the background.
The Team already does something very similar with the web based card Previews.
These too are PreRecorded movie files, but include the mask that is used to show the background.