These poinsettias are made from red felt. I downloaded a free printable from online and cut two patterns from it. You could even do it freehand. Just make one layer with 6 petals (they are kind of flame-shaped), then make a second layer a bit smaller with 6 petals. You could get ambitious and add a few green leaves, but that might be too thick to fit behind the knob.
Cut a small slit in the middle of each piece, remove the knobs on a cabinet, then attach the flower behind the knob.
Red looks great on a white background, but you could think about snowflakes for a dark cabinet! You could even make those out of cardstock, since there's a lot more cutting involved.
This is the first of my Christmas decorations to go out. I have too coordinate with my boys to get all the boxes down out of the attic, which I plan to do ASAP! Good thing Thanksgiving fell early this year (hope you all had a Happy One!) because it gives us more time for Christmas decorating!