Original graphics were taken from SMWCentral, please don't give me credit for making them (though I did import them). The colored blocks are meant to be solid, but I made them sizables since I was too lazy to make individual blocks for every single one. Therefore, you'll want to place invisible solid collision over them.
This is meant to be used for SMBX2 PAL and later versions, since you can create properly sized one block wide and/or height blocks. Other than that, this works with every other SMBX version that supports .PNG files.
Download:
https://www.dropbox.com/s/x6jfhbpnkaob8 ... b.zip?dl=0