I'm thinking of getting a background for use at home, for my wife and baby since we don't have any uncluttered walls.

I have a few questions.

are the stands same as light stands? the top stud looks randomly different.
the Cross Bar doesn't seem standard either. I have 1x 2m +1x 3m, so I could just get another couple 2m (?)

what backgrounds are there? I've seen muslin in a shop, and some plastic dimpled stuff in a studio, I'm not sure what the options are or the properties of each.