I got the chicks a perch and put a kitty ball on a string and hung it for them to peck at. They LOVE the ball, pecking and pulling at the string. It's pretty funny. A few of them are using the perch as well although they fall off a lot.
I put them on pine bedding yesterday and they love to scratch at it and kick it everywhere. This is so fun. I just hope I can get a coop made in the next few weeks.