This is also a great pattern if you have an extra special button that you just don't know what to do with, but want to show it off. You can use a muted colour such as white, or ecru to make it stand out even more.
And if you are looking to make some extra cash and sell these, which I'm always cool with btw, the cost to make these is next to nothing. You can purchase crochet cotton thread for very reasonable costs, and reuse buttons you've collected, found at second hand stores, or even for cheap at many big box stores.
There is also an ad supported version available to read online at KweenBee.com.