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Tile Layer Pro has a feature where you can arrange tiles, but it's still probably not what you want.
You can take a screenshot of the title screen etc. and edit it to your liking then paste it back into the ROM. You can also write a program to dump the data and display the raw tiles as it would be in-game.
the thank you mario palette is the same as the pipe palette by default but it's just the same as whatever the existing palette is (for instance if you put coins where the text will appear, the text will have the same coin color)