So basically I found these in the corners of the map

[Pinality]

http://gyazo.com/99dadfcf15cd92e9703091219f8b0871
http://gyazo.com/902664908bae9eddf69afaa7303945cc
(Dont know if someone else has noticed them)
And they might be just an accidental placement of grass but still.

[RAppel]

Woah! This is news to me.

[Phoner]

What is it?

[cariacou]

Visual artifacts of the grass texture merging in the corners

[ROBveteran]

noticed this a long time ago, assumed it was a bush.

[Jwp721]

if you go into edit base mode and clear off your entire layout you will see artifacts down the entire middle of the grass and not just the corners. Seems like C of C did not create the entire filed but only half and then did some type of flip to create the rest.

[jammer0816]

Zoom in on the right side corner and see the spider like creature ready to attack your base. =)

[dragonx10101]

That's just the result of reflecting the grass from one side to another. Supercell probably did this so they didn't have to create a whole new grass image for each side.

Somebody else posted a thread about this a while back; I believe somebody pointed out that the human brain will always try to find faces in any environment.

Cheers