The bookblanket hashtag on Bluesky features granny squares and other Crochet shapes that textile artists create as part of making a blanket out of their Reading Logs. Each granny square is one book / data point, using color not to convey some other data, but as an abstract representation of the book cover.
A granny square by Heather (@iamhthr.bsky.social) on Bluesky.
A chain of book granny squares by Gwen Kok (@thewoollycloset.bsky.social) on Bluesky.