I have some old Singer sewing machine drawers without the frame.

attach to wall for shelving?

Here are some ideas on Hometalk. People have made them into shelves and other things. Maybe one of these ideas will inspire you - https://www.hometalk.com/search/posts?filter=drawers

https://www.pinterest.com/explore/sewing-machine-drawers/?lp=true

Paint pretty colors & put in potted plants. Display hand towels, perfume in bathroom make-up,lotions,under the sink for scrubbers,etc.

What a great find to put a drawer on your wall for decorations! It is a perfect shabby/chic look or small space decor like a bathroom or hallway or spare room. I would probably put it in a living area by a door or something and find a way to use for keys or mail or something.

they are great to put flatware in.

I used to sell these at my yard sales, but usually put a top on them so they could be free standing. These "boxes" are rather narrow and long and deep. They could hold potted plants, They could be very attractive. How I loved to go through my mothers sewing machine drawers when I was little! To me filled with wonderful things!