Consequences are very difficult to list, because so many factors can be involved in them: background of the situation, developmental stage of the individual, heart attitude, frequency level, resources available, etc.
They can be simple:
When giving a toddler some juice, you hand her the sippy cup but you keep hanging on and don’t let go until the child says Thank You.
When sitting at the table for a meal and your child wants more rice, not passing the bowl of rice until the child says Please.
Or more elaborate:
Providing jobs and materials around the house and yard (that you would normally pay someone to do) so your child can earn money to buy a replacement cable since he lost the one that belongs to his friend.
Driving your child to your friend’s house so she can apologize in person for being disrespectful and creating a disturbance in her co-op class yesterday.
. . . the possibilities are endless . . .