There will be a total of 4 bonus quilt blocks. It's completely up to you if you want to make them/add them to your quilt. On December 1, we'll post different quilt layout options using the 12 monthly block and using 16 blocks (the 12 monthly blocks plus the 4 bonus blocks). If you want to sew your blocks together as you go, you can sew your bonus blocks together to make an extra row at the bottom of the quilt.
If you're on Instagram, please share pics of your blocks and use the hashtag #moremodernhstbom and #modernhstbom2020 so we can see them. Feel free to tag Zina (@zanymouse) and me (@stephjacobsondesigns) in your BOM posts. You can also post a pic of your block on my Facebook page, Steph Jacobson Designs. (There will be a photo album for each month's block, and you can add your picture as a comment in the album.) Since many of us will have more free time on our hands, it is DEFINITELY not to late to get started. You can find links to all the quilt blocks on the "2020 Modern HST BOM" page here on my blog.
Virtual hugs to you all!