I've never seen this. Brilliant idea. I usually take dressing separate to salad but this could work too.
I like: lettuce, red pepper, cucumber, pine nuts, avo, feta with a lemon/oil dressing for a v simple salad.
Yesterday I had new potatoes, tomato, feta, avocado and green beans which I just dressed with oil and a little salt.
Or couscous, chicken, fried courgettes, pine nuts (optional), tomato, yellow pepper with a pesto dressing.
Dh likes butter beans, tuna, tomatoe, red onion, avocado (or green beans if we don't have any), with a olive oil/balsamic dressing.