Thank you for all the replies!!!
I already have a big room for them
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This room will only be for litters and most of the time they will be in their ex pen in this room (like at night and when I am away) so they won't be running the whole room all the time.
I will also be sharing the room with them as I'm still incorporating my closet in there too.
So I still need to make it pup friendly but also functional. LOL
But I have some good ideas. I also found VERY cute decor on Ebay!