A lot of pixel art uses specific palettes. This is partly to keep the size down, but it also allows the image's appearance to be changed on the fly later by simply modifying the palette. I was wondering if it would be feasible to incorporate indexed palettes as an option for Construct 2's Sprites and/or Tiled Background objects? This would allow users to reuse assets by simply specifying a small .pal file, or something similar, as opposed to re-importing a duplicated set of assets with a different palette added in an external image editor.
Construct 2 already compresses images into 8-bit files if asked to, and I believe it can be done with HTML5, as shown here.