Oooh I've had several Sunset Valley saves that has spawned repeat couples plus new ones I never thought of but ended up really liking.
Some of my favourite pairings are
Holly Alto and Bebe Hart. There already best friends and come from very different families. I feel like they just get each other and are very cute together.
Madison VanWatson and Connor Frio. They've got together in a few of my games and been really cute together. However I also really like Connor with Agnes Crumplebottom (2 good looking book-loving loners that can just sit and read together and produce gorgeous kids!)
Emma Hatch and Cyclone Sw0rd plus Blair Wainwright and Stiles McGraw tend to get together alot in my games too and I'm all for it! Kinda feels wrong when they get with anyone else. Blair and Stiles give me that cheerleader and the jock vibe while Cycl0n3 and Emma give me the geek and the goth vibe.
Jamie Joline and Leighton Sekemoto. This happened in one of my saves and they had SO many children together (completing Leightons lifetime wish of being surrounded by family) and every single one was gorgeous.
Fiona McIrish and Molly French is another pairing I really like. Two single mums living together and raising their daughters together. Cute! Ayesha Ansari and Tori Kimura is enough pairing I really like. Ayesha is described as "the floundering tomboy" and that floundering tomboy needs a lady to love
Some alternative couples are
Ayesha Ansari and Cyc0ne Sw0rd. I really didn't expect this but they are both genius' and live next door plus they had some gorgeous kids! (In this save Emma was with Jared Frio - They work together. I still prefer Emma and Cycl0n3 personally but can accept this parallel.)
Dorie Hart and Geoffrey Landgraab - Definetly not your usual ship and again, very very different but I really them together. In this save Nancy was having affairs and Geoffrey found comfort in Dorie.
And Finally Morgana Wolff and Abraham Finkel. This is much more recent one but when I paired them together, they were so loved up and kept getting the 'Faithful/Pure reputation' around each other. It was so sweet and they had some stunning kids! (I do love Morgana and Thorton but with Thortons commitment issues and dislike of children, Morgana deserves someone more family-orientated)