for X = -2500, 2500, 512 do
    for Z = -2500, 2500, 512 do
        local P = Instance.new("Part")
        P.Anchored = true
        P.Locked = true
        P.Size = Vector3.new(512,3,512)     -- By Bouyer the Destroyer
        P.CFrame = CFrame.new(X,0,Z)
        P.BrickColor = BrickColor.random()
wait(0.5) -- always include the wait in "while true do" (infinite loops). Otherwise your program will crash.
end
end