Tombola tickets are an item in Dragon Quest VII. At the underground haven (present) you can exchange 6 monster stamps for one which, once the haven has more residents, you can give to an old lady who will spin the Tombola and you have a chance to get a prize as stated below:
Black ball: No prize
White ball: 1 tombola ticket
Green ball: Shiny bauble
Blue ball: Elfin elixir
Red ball: ?( Item that lets you have 1.5X the amount of gold/exp for 30 min)(Forgotten the name).
Silver ball: ? (Item that lets you have 2X the amount of gold/exp for 30min)(Forgotten the name again).