I'm not sure how to represent the "north-south" running ropes, so I left them out.
Obviously having a unique color for each kind of stockpile isn't viable, but you could probably group stockpiles into a few colors, and then the objects in the stockpile should help clarify too.
EDIT: Added alternate with flags in a different corner.
This is a great idea. Now its a designated stockpile area.
Id much rather look at thiswhile playing, Even though it might be less "readable" in edgecases.
I actually think this is more easily "read" as being a stockpile. Mephs outlines are basically back to ASCII, with abstract but readable symbols for Everything (no offense, its crystal clear and readable, but might as well be an ASCII symbol).
It makes a Lot of sense, that a designated stockpile area would look like this, if it Shouldnt be fully abstract
If there could be a double rope where stockpile borders Meet (Maybe only for the north/south ropes), it might make things clearer. But maybe it would be more messy than the current mockup. Just a thought
You could make the north/south ropes just 1 pixel thick, without the black outline? (Maybe Also the east west ropes, for consistensy, Even tho they ARE pretty and could be left as are).
Also, i cant really tell how many pixels wide the sticks are, (4?) but you could place the north/south rope on the "innermost" pixels on the sticks (the pixels closer to the actual stockpile area), so the ropes dont overlap to much of the stick.
Maybe the outermost would make more sense, but placing them innermost could Maybe make room for double ropes Where the borders of stockpiles Meet?
I Think the flag situation you have makes most sense on the image to the right(but that might just be Because of the specific way these stockpiles are placed). If You could put flags in the diagonally opposite corner as well, so 2 flags per stockpile border, I think it would be perfect.
Maybe Some planks strewn about inside the outdoors stockpiles, for "leveling" the ground, giving stability, when placing, say a cabinet outside in the grass, you Wanna make sure theres Some level ground to place it on.
It could be Some planks (saturated in color, so they dont pop out to much), crossed over eachother/laying parallel to eachother, to make small "bridges" over small (abstract) holes and irregularities in the ground, on Some of the tiles, when the stockpile is outdoors.
(Could also be used for dirt paths, planks strewn over muddy spots on the path etc)
It might make it even clearer, that the area inside the ropes is for placing things.
(Again, might also mess things up visually)