To keep everyone at home occupied I made a quick puzzle. In searching for something automated I ended up wasting more search, rather than making. But I think I found simple process of designing them. I encourage you to try, but for those in a hurry, you can use the file attached.
If you want to be a bit evil, use draftboard or acrylic, something without a grain or pattern engraved.
Making you Own
I started out with a grid in illustrator. I just created a square and did a step and repeat. I used a fill of white to aid in selection.
Then just start selecting boxes and coloring them.
Use select > same > appearance then unite with pathfinder.
You could unite them as you go, but it makes changing your mind more difficult.
Once you have created your puzzle shapes, use the pathfinder tool and choose outline, select all and set the stroke to a single color and give it a weighted stroke.