It would be cool to see a digicomic like Policenauts done with LD videos for cinemas and stills that are balanced to blend in with PCE graphics.
It would be neat to see a quality shooter which uses fmv backgrounds that are actually pre-rerendered PCE color/res to look like traditional 2D graphics, only with all kinds of layering and special effects not possible on 16-bit consoles, plus tasteful sections cgi, like Fast Striker, only not just the same 1 second loop for an entire stage. Above the videos layer, would be a top quality PCE shooter, no different than one which runs exclusively on PCE hardware.
Regular PCE CD RPGs would be cool to see with LD video for the cinemas. Like Gulliver Boy with the same cinemas, only LD quality or Tengai Makyou II with the redone cinemas from the PS2/GC remakes.