sew them onto a winter hat, the ends of a winter scarf, or glue them on to a pin and pin to a winter coat. If you do some in pastels then you can pin them to your spring jacket. You could make them out of old book pages or news paper or paper bags and spray paint them and put them into a bowl for a center piece. Use old books for a vintage feel or tea stain the paper.
Try duct tape, bet they float, then you could do a a floating center piece!
For Christmas you could do them in paper and spray paint, add glitter and a loop on the back then hang them on the tree like snow flakes