Properties (changing the color of a block) doesnt work?

workspace is "Workspace" and if you want this to loop, then use while true do

while true do -- this loops your script while true = true. And true will always = true lol
    game.Workspace.Part.BrickColor = BrickColor.new("Really red") -- Capitalization is key :)
        wait (5)
    game.Workspace.Part.BrickColor = BrickColor.new("Electric blue")
        wait (5)
    game.Workspace.Part.BrickColor = BrickColor.new ("Sea green")
        wait (5)
    game.Workspace.Part.BrickColor = BrickColor.new ("New Yeller") 
        wait (5)
end

Hope this helped. Accept if it did. :)