Need ideas for non-turkey meat for Friday after thanksgiving, please? To go with leftover mash potato and green beans.

Braised ham - ham butt in a le creuset, add water to cover about halfway up, and cook at 275 for 5-8 hours.
Extremely easy, falling apart (not the most attractive) delicious ham. You could probably do this in a slow cooker as long as the lid seal is fairly good.

How about some steak?

Mashed potatoes and green beans are pretty versatile - almost any roast or braised meat (pork, beef, lamb) or the aforementioned meatloaf would work.

The only thing I'd avoid is another roast bird - chicken, duck, goose...after a major roast turkey, some variety is a good idea.

Pork chops would be good too. Or burgers sans buns.

Meat loaf? There are a bunch of great recipes on this site.