Awww, how sweet. You know that fuzzy effect that everyone loves where you have a figure in focus in the foreground and the background is all blurry? That’s called bokeh. Well, this lets you turn lights in the background into odd shapes using what is essentially a lens cap with a shape cut out of it (Hint: you can probably do this yourself).
The caps cost $9.99 and you can order online so if you don’t have a Dremel and a dream you can get some ready made shapes including a star, a heart, and a spiral.