The good thing about holidays and celebrations is that they give inspiration to what you can paint. For bonfire night we both attempted fireworks (where Gema's turned out better, especially with the "caviar" addition). When doing fireworks, it can be really tricky to make it look like something is happening, and all the tiny middle steps and colour swapping can be quite tedious. Using glitter polishes also helps, even if they're a lot harder to remove later.
For Halloween we had very similar designs again, at least for Frankenstein and spider webs. Charlotte attempted a skull and some chains whilst Gema went for dripping pattern and a Dracula.