I too am really into pineapple, banana, and ginger! I add leafy greens to mine.
I almost always keep a batch of frozen banana chunks in the freezer for smoothies as I find they make thicker and richer smoothies. I love berries...raspberries, blueberries, strawberries, blackberries...so those often make their way into my smoothies. Blueberry and mango with a little ground flaxseed and some kale is nice. I like dense fruits like mango, peaches, apricots, cantaloupe etc for making smoothies as they make creamy smoothies. but I have done more juice based smoothies also. Carrots and oranges are a favorite too! I generally don't add greens to that one as I love the bright orange color of it! I have also made watermelon frosties, which is just watermelon and a pinch of maple syrup. Nothing else added, though a tablespoon or two of water may be needed. I also freeze other fruits I buy fresh, like pineapple, cantaloupe, and especially berries.
I do sometimes use protein powders in smoothies but not always. I have been trying to use more chia seeds in them instead lately. Very occassionally I might add almond butter in there, or avocado, but I like to keep my morning smoothies or juices lighter so I usually do that for a treat or at dinner.
For leafy greens, spinach seems to add creaminess to a smoothie, while kale makes it more crisp.
Oh, and raw Thai coconut! Or shredded coconut if you are lazy. Pineapple, coconut, and frozen banana with water added is great!
Another one is canned pumpkin, banana, molasses, and in this case I do use a splash of almond milk.
Mostly I do not use plant milks in mine but sometimes I do for an extra bit of calcium. I like to add some leafy greens in there for the calcium, iron, and protein also. I'm not a huge smoothie drinker though, maybe a few times a week, some weeks not at all and others daily. Just depends on my mood.
There is a local cafe in my city that makes vegan veggie blasts in their vitamix blenders right there in front of you. They always have interesting combinations I would never think of. Some examples are:
Sunrise- oranges, carrots, and apples
Purple Power- beet, blueberry, spinach, apple, and lemon
Detox Kale- celery, kale, lemon, apple, ginger, and pineapple
Green Lemonade- kale, spinach, celery, cucumber, apple, and lemon
I have had the Sunrise, Green Lemonade, and Detox Kale so far. I forgot that I sometimes add celery or cucumber to my smoothies. Cucumber is great with fresh mint leaves and honeydue melon (the green melon).