The ornamental design for a blank for forming a lid for a container, as shown and described.
The file of this patent contains at least one drawing/photograph executed in color. Copies of this patent with color drawing(s)/photograph(s) will be provided by the Office upon request and payment of the necessary fee.
The sole FIGURE is a plan view of a blank for forming a lid for a container embodying my new design.
In another embodiment of a blank for forming a lid for a container, the colored portions represent a contrast in appearance.