You know, like in this picture: http://qsu-tool.tk/viewimage.php?imgid=5300335 (yes, that is from the Community Remix), and you can also do it in New Super Mario Bros Wii. Is there an already existing tile that lets you do this that I have missed or do you have to some sort of ASM hacking?
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You didn't search enough in the forum and in the game. Some tilesets have the behavior you want (the grey blocks of te desert tileset being one)

This might be useful for you http://nsmbhd.net/thread/14-tileset-editing-faq-and-how-to-s/
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Ah, thanks.
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