local pos_x, pos_y = 0, 0
local subpanels = {}
local col = Color( 200, 200, 200, 240 )
local space = 8
for i = 0, 30 do

    local p = vgui.Create( "DPanel" )
    p:SetSize( 32, 32 )
    p:SetPos( pos_x, pos_y )
    p:SetBackgroundColor( col )

    pos_x = pos_x + space

    if pos_x > 3 * space then

        pos_x = 0
        pos_y = pos_y + space

    end

    table.insert( subpanels, p )

end