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A warmer colorway would look better with a brown sofa.

This seems so dark and old-lady colors for two children, brown leather and dark green?

IMO a much more fun rug for and I really would want something from ruggables that I could wash in a kids playroom . Can we see the space I amnot sure what you need for storage but I alwys like kids to learn how to put their stuff away but you need to supply places to put it. I think the sofa ia going to be it for seating . Do oyu have a TV in the space ? A credenza does not say play room to me so a bit more info and pics of the furniture please . Also posted in a commnet here just like you did with the rug.