I could always use more kits about running.
Disney Running, Running couture, (half) marathons, etc.
I have several kits, but they are mostly about sports and health in general. And I only have 1 medal-element in total.
And I second the restaurant kit. I could definitely use it for our vacation pictures.
Grocery shopping. I have several kits about shopping in general, but not much grocery shopping, supermarkets, etc.
A Netherlands kit would be nice too.
Or kits about Greece, Egypt, Germany, England (London), France... Still have vacation pictures to scrap