We do this project every year to make a fun and interesting month. Each night, I have each of my kids write one thing that they are thankful for, their name and the date that they wrote it and put it in the jar. On the last day of the month, I have them gather and we read everything that was written together as a family.
Not only does this give a good homeschooling writing skills to my younger kids, but it allows them to focus on positive only. For my older kids, this help them explore some of their creativity by having them write memories.
You do not have to use vinyl or even a cricut machine. You can cut a simple tag and tie on the top of the jar with ribbon or yarn. You could use letter stickers. You could add fake leaves or flowers or you could just leave it plain.
Here is a step by step of creating with vinyl: