Creative Mommas Needed!

I need help! I’m trying to redo our back bedroom (3 bed home, 5 kids, but 2 are still in our room at night) for my 3 year old and 5 year old son. I was thinking maybe chalkboard walls at the bottom all the way around or at least one chalkboard wall, and maybe one of those sensory swings that hang from the ceiling (Amazon has them for like $40) (my 5 year old son has sensory processing disorder where he craves movement, noise, pressure, etc) and maybe one of those mini trampolines for toddlers. They have a wii in the living room (so I can make sure they don’t touch it, they break almost everything they touch) but I’m wanting to completely redo their bedroom back there so maybe they won’t be as bored. I feel like they break so many things and get so tantrum-y because they’re bored. So anyway, what are some other ideas for their room? And inexpensive please... we’re kind of on a budget lol.