Color Changer gui problem?

Hi, im trying to make a brick color changer GUI but im getting really confused about what im making right now, so if anyone can help me fix this, it would be really appreciated! Sorry if this is a little messed up :/

local num = 20 --amount of colors
function OnClicked()
    local player = script.Parent.Parent.Parent.Parent.Parent
    local color = script.Parent.Parent.BackColor  --this is where the name of the color should be
    local c2 = script.Parent.Parent.BackName
    local c1 = game.Lighting.Folder:GetChildren() --this is where i store my colors in string values named color1, color2,color3 etc.
    for c1 = 1,3 do --this is where it gets messy
    if color.Value == "None" then
        color.Value = c1.Value 
    else
        local n = tonumber(c1.Name:match("%d+"))
        if n == num then
            color.Value = "None"
        else
            color.Value = c1.Name..(n+1).Value 
        end
    end
end

--(the part under is fine so i dont need to add it here)