I have (in my head) made a list of these extra 'emergency' photo ideas. A couple of nights ago it got to 11 pm before I remembered I hadn't taken a photo, so I took one of my back garden covered in snow.
Some of the ones on my list are
Handbag
Contents of handbag
Cosy corner where you spend your evening
Computer (showing DD possibly)
PJs
Your favourite mug
Favourite ornaments
Other family members' favourite books/DVDs/whatever
Just a short list, but I've already used a couple of them
.