Tips for illuminated decorations

Dear community,
Do you have any tips for illuminated / light-up decorations / decorations with LEDs that you’d like to share here?

There are quite a few ideas out there.
In recent years, I’ve filled beautifully shaped bottles with string lights and decorated the outside with pretty ribbons. There are even special string lights designed for bottles.

Or you can use string lights adorned with little paper stars. That’s quite time-consuming, though.