Make plaster of Paris models of football players, then paint in the national team colours of the player you draw, water based glue
Plaster of paris, molds of football players, paints, stiff card, sharp knife, plenty of containers (preferably disposabal), floor cover/protection (can get messy)
Make up plaster, pour into molds, cut out card with hole so you can suspend mold whilst drying. Turn out, seal (weak washable glue), dry and paint. Would run over two weeks (you can then upgrade any models that come out badly, without dissapointing the scouts or cubs.