The furniture you choose to put in kid's play room depends mostly on your family's definition of "play room." If your play room is for a toddler to have lots of running room, your furniture will differ greatly from the play room designed to give adults the feel of a sports bar atmosphere.
If your kid's play room is designed with a mobile child in mind, you probably will not need much furniture. An appropriately sized table for the child to sit at while coloring or drawing, playing with puzzles or doing crafts is a must along with a sturdy chair. A good toy box that could double as a hope chest for the child later is another good furniture item to include in the kid's room. Throw in a couple of chairs for the kids to wallow on and your furniture needs are met!
A play room for older kids will differ in its furniture needs. A table with sturdy chairs will still be vital. Older kids who like to watch television or movies and play video games will also need a solid entertainment center or tv stand on which to hold the tv set. You'll need more seating for older kids, too. They tend to have more friends visiting and will require more seating area.
If your kid's room is going to be used for hobbies, make sure your furniture is suited for the hobby of your choice. If your hobby is scrap booking, you will need a good, comfortable desk and a nice chair. A hobby such as needle point would require a comfortable chair with good back support and good lighting. If writing is your hobby, your "play room" may take on the look of a home office instead. Invest in good furniture that includes a computer desk and a comfortable chair.
No matter what your family's definition of "play room" is, you can utilize it best and get the most enjoyment from it when you furnish it according to its intended use. Don't put a lavish sofa in your play room if it will be subjected to frequent spills and gooey drops of food. Likewise, don't expect to be comfortable on furniture that is way past its last legs. Know your space, know your needs, and know your budget. When you take those things into consideration, you will make good decisions regarding the furniture and accessories you select for your play room and you can concentrate on what the room was intended for - having fun!