The best ingredients for a custom salad include a variety of greens (like romaine, spinach, or kale), colorful vegetables (such as cucumbers, grape tomatoes, and carrots), a protein source (like grilled chicken, tamari tofu, or salmon), and toppings that add texture—think avocado, fried wontons, or croutons. Finish it all off with a balanced dressing to tie the flavors together.