Great thread and some brilliant ideas. Never tried making a warm salad before, so definitely going to have a go - I adore roasted veg like butternut squash.
Some of my favourite salad ingredients are (not all together and not just on their own!) olives, sweetcorn, pickled onions, sun-dried tomatoes. I usually need a bit of zing in whatever I'm eating, so I add Tabasco to salad dressing. Or pickled jalapeno peppers. Or ricotta stuffed peppers from Sainsbury's - love those, just enough zing to make it interesting.
I love spring onion too but rarely use it in a salad. I always worry after eating it that I'll be able to drop a person at 10 paces just by breathing on them!