Depends where ou live. Old houses often have staircases made of wood.
For not so “classy” wood, go to a construction site.
I did that when I needed textures of cinderblocks. I went to a construction site down the street and asked the foreman if I could take a few pictures up close of the blocks and the fresh mortar. Of course I mentioned that the pictures would make me so happy I could forget the create of beer there that I always carry around 
For stuff like rugs, you could go to a fancy restaurant with fancy rugs. Again, ask them: “Wow. Your restaurant is so awesome, already told all my friends. And the rug, the rug! Can I make a really good photo. I like to have it on my tablet as a background :o”
You would be surprised how many people actually say “Weird, but ok. Knowck yourself out kiddo :)”
Its a bit harder in a museum, naturally :rolleyes: