Ok well my tips are these:
Breakfast cereal with dried fruit scattered on top such as juicy sultanas or apricots.
Then I tend to make my own smoothie for me and the kids that has fruit, natural yoghurt and milk to keep them going until lunch (esp as dd doesn't have lunch until 1pm). To sweeten them I just add honey. The kids love it.
In their lunchboxes add a little tub of chopped up or sliced fruit such as bananas, kiwi fruit and tangerine segments. You can add a little yoghurt to this to make a nice dessert for them.
Salads don't always have to consist of lettuce and cucumber either. I add some raw carrots, sweetcorn pieces, peas and anything else they can eat raw!
If I do treats, I usually bake scones with dried fruit or a fruity flapjack.
For tea, I always have a bag of frozen spinach blocks handy which is useful for ds who hates vegetables. I can do spaghetti bolognaise, shepherds pie or even a curry and I'll add a block of spinach which just melts into the sauce and is hardly noticeable at all.
Beans are also brilliant for adding to sauces and casseroles.
Parsnips, sliced lengthways can go in with the chips and 9 times out of 10 they don't notice!
Fruit juice is given with tea only.
Another trick is to give them frozen peas and sweetcorn as my ds won't eat them cooked, but loves them frozen!
In the summer we have smoothie lollies, banana lollies and even tomato juice lollies. Turn that hated healthy stuff into a lolly and suddenly it's fun!