I am starting a new relegation style league. It will actually have 3 leagues of 12. The first year all three leagues will be equal. Next year the top league will be made of the top 4 finishers from each league. The middle league will have the middle 4 teams and the bottom league will have the rest. For the following years, the top teams move up a league and the bottom teams move down. It works like the Premier League for futbol.
If you are interested check out all the details here.