I do a fair amount of work with leather.  You certainly can cut it up into placemat-sized rectangles. I do that type of cutting with a rotary cutter. You might want to round the corners- not essential, but I think it could look better.  You should certainly burnish the edges.

You treat them with a burnishing agent such as the Tokonole that Hideout Hen suggested.  That is one of the best ones. It works well & unlike a lot of others, has very little odor.  You can find plenty of YouTube vids like This on how to burnish. It isn't hard to do.

Other tools you may want include a corner-rounding punch, a mallet (to use with the punch), an edge beveler & a burnishing tool (sometimes called a slicker).

Great colors & de sign. I have never seen the log cabin used in this way.

I rarely work very large for want of a way to support the weight.  How would you support something heavy?

That's a pretty one @Iminei   I haven't seen that design before. The fabric choices are nice and also creative.

So no one here will be throwing any snowballs your way.

And once again, this is why I love you all.

BTW, @realale my husband, whose ancestry is Scottish, loves your screen name.

If you’ve read the rant thread in the last couple of weeks, you will already know what I am talking about.
For those who haven’t, I will do my best to summarize.  I made an hourglass block that I really liked. On another site where I had posted it, I was met with dogma & rudeness.(Evidently, I didn’t make it in the one and only way that they deemed correct.)

   I told them where to go, and am done with them.  You folks are much more fun. I had made this for my quilt guild, where we were encouraged to be creative.  I just love all of the blocks people brought in, so I thought you might like to see the wonderfully creative blocks we all made.

The one I made is circled in green.
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A little more on this.  I have drilled out 5 wooden spools with slightly narrow diameters. I have wound thread on 2 so far.   You may wonder how to make the thread stay on the spool when you begin winding.

I found nothing on this, in my research. So I had to experiment on my own. I started with the simplest thing; I just taped the end onto the spool.  As long as the tape lays smoothly, it will wind neatly.

I had another empty spool from a different manufacturer. The hole in the spool was 1mm (yes, just 1mm) too narrow for the adapter.  I learned that the manufacturer of that thread uses spools made of really hard plastic, when I drilled the hole a bit wider.  Took me 15 minutes, but I did it!