If the answer is "yes" then you can make a button out of it!
Step 1: D. I. Y. (Drill It Yourself)
Take something flat and small enough to make a button out of. Like this Dominotile!
Then simply drill two holes in it and you're finished!
Needless to say that you should use the right drill for the right material. A wooddrill for wood and a metalrill for metal.
I've tried making buttons out of coins... didn't have the right drill.
Step 2: Make the Buttonhole Wide Enough!
The hole should be a little wider then the long side of the button.