Yes maybe the furniture rearrangement theme - but make an obstacle course around/under chairs & tables, walking on a line (like wool or something flat), jumping from one marker to another, limbo under a mop handle.
Dens can be made out of big cushions too (like some sofas have).
Pretend the floor is a river & play crocodiles - if you can cross the room on the stepping stones you're safe, if you miss, you get eaten and have to wait till everyone is out to rejoin the game (make stepping stones out of towels, cushions -good for bouncing- or pieces of paper) If you're okay with them climbing allow stepping on chairs /sofas. We loved this as kids
Any old magazines = Make collages - use flour & water as glue if you've not got bought stuff.
Kitchen orchestra = get pots, pans, spoons (pref wooden) or chopsticks, sieves & be amazed at the range of sounds they can produce. Play some music to drum along to or sing your own. (Preferably one game with a limited time-span unless you like hideous cacophany!)
Wish I could send you some of our unseasonably sunny weather to help.
My children don't "GET" pretend play. They are both very literal. Plus we already do 30 minutes of violin practice a day. I know if i pulled out the pots my daughter would say "mummy, we play music on violin."