My sister has taught kindergarten for many years. Every couple of years I sew new sitting mats for her students. They meet on the carpeted floor for whole group activities, but she uses the mats both for comfort and spacing the students. Some times they are color-coded for grouping, other times they match her theme for the year. She sews, but doesn't have a serger, which makes them go much faster.
If you make a wallhanging, it might be fun to make it interactive. Kindergarten teachers usually fill their wall space with teaching materials (and are evaluated on providing a good learning environment). Purely decorative items might not be practical.