Almost anything flat can be laminated. The best known uses for lamination are ID cards and restaurant menus. However, whenever you have flat materials you need to protect, enhance or reuse, then lamination can be the way to go.
Lamination also stiffens the material, making it excellent for creating table top displays and hanging posters/signs.
Essentially any flat sheet, photograph, poster, sign or card can be laminated. Lamination will protect them from spills, stains, wear and tear, and handling that degrades the quality of the item you are protecting. Lamination also provides a surface you can write on, wipe clear and write on again.