Other ideas compiled here...

• Remember those with limited physical ability. Wheelchair-accessible rooms, cabinets, tables, etc.
• Put in walls that items can be attached easily to. Our rooms are mostly cinderblock, and the only thing that sticks is wax clips. Bulletin boards, chalk or dry-erase boards for writing questions, instructions, etc. are also good. (These items could also be movable).
• When you decide on the "themes" of the rooms, ask the congregation for donations - you'll be amazed at the response. Be specific in your requests and you'll get most things you need.
• If you have a drama/puppet room, a big closet is a huge help! We have costumes hung up, shelves for props, and our puppet "tree" slides inside when not in use. This really helps to keep the children (and adults) out of the items during the week when there is no supervision. (But children do get to walk in and carefully choose their own props, etc., each Sunday!)
• I'd put it lots of electrical outlets (this from someone with a 150 year old building.)
• Cubbies for mail and forgotten projects.
• Put a deep sink in the art workshop.
• Doors with windows so people can easily look in without disturbing the class. In many places, these are "code."
  
  And some important dittos...
• No carpet in the art room, but put in a sink if you can. It helps to have clean up capabilities in the room, and not send kids down the hall to the rest room to wash brushes.
• A great functional drama closet for storage of reusable prop and scenery items and costume storage. You should not have to go to the depths or the sky of a facility to store creative dramatic supplies. They will be used more frequently if they are easy to access.
  
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  With thanks to...
  julie burton
  WendyB
  Barbara in Portland
  Neil MacQueen
  JCarey
  
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  Exchange Volunteer Carol condensed this info.