There are lots of templates and tools to help you do this, but a couple years ago I tried this out by creating what I called a "Photo Word" in Google Slides. This is basically a clever way to make it look like you have a picture inside of a word.
If you want to learn all the gory details about that you can check out my earlier blog post as well as my short intro video and my very long deep dive video all about creating Photo Words.
However, to make things super simple I have a Google Slides template that you can copy and edit to make your own "One Word" for the year.
See below for a link to the template and a short tutorial video on how to make your "One Word" for the year.