One common theme could be adventure. Since they are likely characters in a fictional universe, they might embark on all sorts of exciting journeys together. Another theme could be friendship. They could be shown developing a deep bond over time.
Well, one place to start looking could be fanfiction.net. They usually have a wide variety of fan - made stories. Another option might be Archive of Our Own. Just search for 'Surak and Amanda' on either site and you'll likely find some interesting reads.
A plot could revolve around Amanda Greyson teaching Surak about human emotions in a more in - depth way than he has ever experienced. And in turn, Surak shows her the depth of Vulcan logic and how it can be applied in different situations. This could lead to a unique bond between them and change their perspectives on each other's species.
Another option is to look on FanFiction.net. You can search for 'Surak and Amanda Greyson' in the Star Trek category. Some fan fictions might be about their meeting, or how their characters interact in different scenarios within the Star Trek universe.
Some fan fictions about Amanda Seyfried revolve around her movie roles. For instance, if we consider her role in 'Mamma Mia!', there could be fan fictions that continue the story after the movie ended. Maybe Sophie has a new adventure and Amanda Seyfried's character Donna is there in spirit guiding her. Or in a more romantic vein, there could be stories that explore a deeper relationship between her character and one of the male leads that wasn't fully explored in the original movie.
There are quite a few out there. 'Amanda's Love and Loss' is a fan fiction that really tugs at the heartstrings. It tells the story of Amanda falling in love with a mortal and the heartbreak that follows when she has to deal with his mortality. Additionally, 'The Trials of Amanda' is a great read as it throws Amanda into a series of challenges that test her strength and character in ways she has never been tested before.
Since I don't know of any existing Alyssa Calloway and Amanda Lemmon fan fiction, it's hard to say for sure. But common themes in fan fiction in general can include friendship, adventure, and personal growth. Maybe in stories about them, there could be themes related to their relationship, like how they support each other or overcome difficulties together.
One common theme is the exploration of their professional relationship. Since they work in SVU, stories often revolve around how they collaborate on cases, handle difficult victims and suspects, and deal with the emotional toll of the job.
In many Star Trek fan fictions, Sarek and Amanda Grayson's relationship is often explored in great depth. Their union between a Vulcan and a human was quite unique in the Star Trek universe. Fan fictions might depict how they first met, perhaps on Earth during some diplomatic mission of Sarek's. Their cultural differences would have presented many challenges. For example, Amanda's more emotional and open nature as a human contrasted with Sarek's Vulcan restraint. This could lead to some really interesting stories of them learning to understand and love each other, gradually bridging the gap between their two very different worlds.
Another way is to follow Amanda Seyfried fan accounts on Twitter or Instagram. Sometimes, these accounts will retweet or share links to good fan fiction. You can also try reaching out to other fans directly and asking them for recommendations. They might know of some hidden gems that aren't as easy to find on the more popular platforms.