Decent salads are just a simple formula! I usually work to 2 leaves, 4 veg, a grain, bean nut or seed, a protein, a dressing. You need soft and crunchy, sharp and sweet, bitter and salt.
Think about dishes you like and work with them.
Carrot, apple, celery and radish with spring onion and a mustard dressing with walnuts
Watermelon, cucumber, mint, feta and red onion with lemon and honey
Tuna and butter beans or green lentils with leaves, red onion and radishes plus a lemon pepper dressing
Roasted red peppers, almonds and halloumi with olive oil and tomato dressing
Salmon in a sesame miso crust with sliced beans, spring onions, cucumber, radish and carrot with a garlic sesame dressing. Actually I eat that with chicken, pork, peanuts, whatever as it's too good
Peppers, carrots, leaves and chilli with cumin crusted chicken, pink Mexican onion pickles and chilli yogurt dressing.
I'm hungry now!