How do I make something out of small ladder?

I'm sorry I don't understand your question. 4 squares of what ?

I've seen people take small ladders and hang them on a wall as a towel bar. I've also seen people hand them on the wall and place pictures or artwork in between the steps...the ladder acts as the frame.

You could use for throw blankets or magazines hang a magazine on each step

Not all of these ideas are what you are looking for but look thru the list and see if anything tickles your fancy: https://www.diyncrafts.com/26054/repurpose/40-wooden-ladder-repurposing-ideas-add-farmhouse-charm-home

https://www.thisoldhouse.com/ideas/11-ways-to-repurpose-and-decorate-ladders

here's some great ideas https://www.apieceofrainbow.com/18-inspiring-ladder-hacks/