CopyCat 1.2b

local File = 'art_1.txt'; -- put the name of the file you saved the art as i.e. 'hiroshima.txt'

local Players     = game:GetService('Players');
local Plots       = game:GetService('Workspace').Plots;
local HttpService = game:GetService('HttpService');

local UI = Players.LocalPlayer.PlayerGui.MainGui.PaintFrame.GridHolder.Grid;

local FileContent = readfile(File);
local Bytes = HttpService:JSONDecode(FileContent);

for _, Byte in pairs(Bytes) do
    UI:FindFirstChild(_).BackgroundColor3 = Color3.fromRGB(Byte.R, Byte.G, Byte.B);
end