Well, it depends on the dogs.
My first born (Doodle) was such a wonderful retriever, we trained him to get mommies slippers, and a few other things. He loved having a job.
Another one we taught to 'get the bug'... hehehe, if there was a fly buzzing around, he would get it.
Some we just play ball with, over and over and over again. Ling Ling will actually put the ball in the Chuck-it thing and wait for us to fling it.
Nemo's job is to 'find the puppy', or 'run the puppy'. He's the one that gets em going.
Joy's job is to be a princess
Chip, well, chip is a baboon and his job is to get on tables and knock stuff over. Also, we have this big leather ottoman that HAD wheels on it. Chip would jump on it and it would go flying across the room. BAHAHA, we took the wheels off.
I think it depends on your time, energy and your dogs ability to play along.
Mostly we play outback with balls, hula hoops (we try to get them to jump thru) and sometimes we hide stuff in the yard and have them go find it. Little sniffers are really good.