I 'merely' corrected the colours to match them those from "background-29". However while the original sign is auto-placed at the beginning of each Super Mario Maker level and is only available for the 'right' direction, I added 7 additional ones. It would be nice if we can add them into levels. Since it would be a total waste to overwrite several background objects it would make sense to add this as a new npc (as like as npc-151). To select the direction the arrow is supposed to point, you need to choose the direction within the "Advanced NPC Settings" (see NPC-304).
BTW: i do know there are other direction signs for SMB1, SMB3 and NSMB, but the "original" SMBX widely already features mostly Super mario World graphics ...
