My thought every time I cut pakchoi (and other vegetables in cabbage-family) is, "Hey, the leftover looked like rose!" Instead of going to garbage immediately, let's play with them.
See? The vegetable leftover forms a rosy shape
Stamp it! My pak choi only had few leaves, so the rose is not full.
Voila, a bouquet of roses :D
Stroke a bit of paint in empty spaces at the roses to create more rose petals. Have fun!
Tips: use vegetables with more leaves to create fuller rose ;)