Many tiles ripped from Red Version, a few minor edits, and some tiles from Gold to have different tiles for the inside of caverns.
The only tiles I believe I am missing are Game Corner tiles, Celadon Mansion specific tiles, and angled table corner tiles.
Other than them, it's pretty much everything! (At least as far as I've checked.)
For Rm2k(3), I may colourize it sometime but I've got held up with other things...