Colourful leftovers

I made 175 dubbel hearts for an order... So 350 times a little heart, then attaching 2 together and filled it with leftovers from my own yarn. 

This means that I had a lot of little threads. What to do with them? Using them for filling up other items or maybe stick them with glue on a wooden board or on a piece of paper as a card....

Any idea? Looking forward to your reaction