Is it possible to make a dark-mode OLD theme?

For example, instead of the background being day, its night and the colors are basically inverted. I think it'd be nice since i use the Old theme alot and i really like it but its pretty harsh on the eyes. Not saying it should replace it, but it'd be nice as a new theme. And yes, i know the old theme is supposed to represent the old styles, but a bit of a "less-harsh-on-the-eyes" isn't too bad. Thanks. I put it here since i don't really know if forum suggestions belong in the Suggestions Board. If i'm wrong, please move this to another board.