Rip these buttons to CSet 2 in the main/overworld palette, then you can use them in any palette. They are prearranged in tile order for you to combo, each combo uses one tile and its "Next" combo is intended for the tile immediately succeeding each prior tile/combo.
The top dungeon tiles are 4-colour dungeon tiles that Classic already comes with. If you want to use the bottom dungeon tiles that have orange buttons, you need to add the three orange colours to the right of CSet 2 in each level palette.

How to use:
These are typical Step->Next and Step->Secrets combos, with the pushed button being a (None) combo that is the "Next" combo of that combo, or you can use them with 66 Block Trigger flags to have pushing blocks on them trigger secrets, stairs, or shutters. For the buttons that are hidden in tall grass or under a bush, then you'll want to make a Tall Grass or Bush combo, where the next combo is the revealed button combo (either a Step->Next or Step->Secrets combo), and the combo after that is the pushed button. For the buttons that are hidden underneath Haunted Tiles, then you want to make a Spinning Tile combo with identical graphics to the normal one, have the next combo be the revealed button combo ((either a Step->Next or Step->Secrets combo), and the combo after that is the pushed button.

Nintendo
GameMakr24
TheOnlyOne (for being the type of guy to hide buttons underneath tall grass, bushes, or haunted tiles)