LOL! Most people are plenty boring - I just think it's ok to have a couple of standard flavours on hand to appeal to all those vanilla types unlike weirdos like myself
You haven't met my son - he's incredibly, astoundingly stubborn and assertive. Reminds me more of my dad than myself...
Secret number one to getting kids to try new foods; don't tell them they have to; just eat it yourself and and make yummy noises.
When they ask; tell them its a secret food only for adults.....
Second, involve them in making/trying new stuff as a play activity, not a meal activity.
A great way to do this with sweet stuff, is having vanilla ice cream just 1 tsp, in each of multiple ramekins, then tell the kid to put any one sauce on each one; raspberry, strawberry, caramel, mint, pineapple, maple, let'em go nuts.
Encourage them to take a combo they like, say vanilla and maple, and add one extra thing from the selection to that flavour combo, maple-blueberry, vanilla icecream is born.
For savoury, this works well with home-fry style potatoes, and dips on the side.
Garlic Aioli, maple-mustard, BBQ Sauce, Balsamic-Mayo.
A third suggestion is to play w/colour, kids tend to love that. A little Tandoori seasoning and you can turn your couscous or rice burgandy/purple; a parsley-based pesto (you can add basil too) will turn anything dark green; while grated carrot does orange and turmeric yellow.
I don't have kids of my own, but was involved in raising my niece, who started out with a very open mind for a kid, but then went into the stubborn phase around 8.
Her folks had trouble getting her to try stuff after that; but I fixed her, LOL
I picked her up from an overnight camp and we went camping in a provincial park. I wasn't mean about forcing her to try stuff, but I simply said she had to pick from what I had in the cooler or the spice kit/pantry kit.
This is what got her hooked on expensive balsamic vinegar which for a while to her mother's chagrin, she wanted to put on everything! LOL
She liked the sweetness and she found she was only moderately keen on Hot Italian Sausage done over the fire, she sliced it and drizzled in balsamic and declared it a culinary delight.
Between that and getting her to fall for really good aged Parmigiano Reggiano, her mother was of very mixed view on my successful breaking of her royal fussiness. I think I added $50 to their monthly grocery bill.
However, by the time the kid was 12 she was making all the salad dressings for the family, just the way her uncle taught her.