I now humbly present what may be the most overkill tileset yet.
Take SJB's previous tileset, add in more tiles from Super Mario Maker, go way too far with extras, and make it recolorable gray, and you have a gigantic, but incredibly useful tileset! You can change the palette to whatever you wish, and the tiles are arranged in such a way that you can remove whatever you don't need.http://imgur.com/qwO73Cu
Speaking of recolorable, how about a master version with, say, 30 SMB palettes?http://imgur.com/uQhc6SK
Fun fact! The full 30-color tileset is the largest tileset I've ever made, at 9350 pixels tall. It completely shatters my previous record of NSMB2's full tileset, which was 4743 pixels tall. Even SJB's overkill 220-color tileset was only 6647 pixels tall!
Also I broke my graphics driver making this when I resized it too large. Also also it has so many tiles (over 10,000!) that it overflows with the animated tiles.