I felt this awesome idea had to start my DIY Christmas calendar on my blog! Just had to! I think, as someone who doesn't wear brooches like ever, this could be an awesome idea for your (and my) Christmas tree. All the felt flowers in all different colours would be amazing, especially if one could add some lights to them or maybe some glitter!
DIY Dahlia Corsage
All but one picture is from the site itself, the last one is from Pinterest