I’m always on the lookout for cheap, modern art ideas and this one ticks all the boxes! If you can’t find a vintage picture you like, you could also try covering a canvas in a fabric or paper you like then following the directions.
No instructions are given, as you have to subscribe to the site and it’s in French (which i’m a little rusty on….) BUT, i think its pretty self explanatory. Just make sure you use a good glue/epoxy to keep the spoons affixed to the mirror.