One possible theme could be the idea of Iceland's relationship with a domestic object like the fridge. It might be about how the fridge represents a source of comfort or stability for Iceland. For example, the fridge always having food available during Iceland's long, cold winters.
One common theme is family - like Denmark seeing Iceland as a younger family member to look after. Another is cultural exploration, as both have unique Nordic cultures that are often explored in these fanfics. For example, how their different traditions play into their relationship.
I'm not sure of specific 'Hetalia Iceland x Fridge' fanfics off the top of my head. But you can try searching on fanfic platforms like Archive of Our Own. Just type in 'Hetalia Iceland x Fridge' in the search bar and see what comes up.
I really liked 'Unlikely Bonds'. In this fanfiction, it delves into how Hong Kong and Iceland, despite coming from very different backgrounds within the Hetalia universe, find common ground. It's full of sweet moments and interesting cultural exchanges that are presented in a really creative way.
One popular Hetalia Iceland x Hong Kong fanfiction is 'A Nordic - Asian Encounter'. It focuses on the cultural differences and similarities between them. It has a really interesting plot where they start as strangers and gradually develop a deep friendship which might turn into something more.
One popular hetalia denmark x iceland fanfiction is 'A Nordic Bond'. It beautifully depicts the relationship between the two characters, with Denmark being the protective and sometimes overbearing older figure, while Iceland is the more reserved one trying to find his own place. It has a great balance of humor and heartfelt moments.
Archive of Our Own (AO3) is a great place to start. It has a large collection of Hetalia fanfictions, and you can easily search for Iceland x Hong Kong ones using the search bar. Just type in the relevant tags like 'Hetalia', 'Iceland', 'Hong Kong' and it should bring up relevant results.
Fanfiction.net is another place to check. There are many Hetalia fanfics on there as well. However, the tagging system might not be as precise as AO3, so you might need to do a bit more digging. But it's still a good resource.
There's a fanfiction called 'Iceland and Hong Kong's Adventure'. In this story, they go on an adventure together in a fictional world within the Hetalia universe. It's full of fun and interesting situations, like solving puzzles and making new friends. It's completely appropriate for all ages as it doesn't have any inappropriate themes or language. It mainly focuses on the bond that forms between the two characters during their journey.
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