When I first heard of this tip I thought it was crazy, a friend of mine said, "Use variety when you cook, make the plate colorful and pretty!" I had 4 kids and who had time to make a pretty plate. But, I did notice that when the plate was more colorful my kids did eat better. To make this a bit easier I bought all my fruits and veggies and cleaned all the ones I could ahead of time.
So, I clean my broccoli, cauliflower, celery, washed apples, pears, etc...then when I fix mealtime plates it is so easy to make it pretty and colorful. If we are eating a pasta dish (which is mainly white) I will put some broccoli on it along with a few slices of apple and tad-ah a perfectly pleasing plate! Having everything cut up and ready to go makes this process quick and easy especially for lunch.
I also try to vary texture and tastes! Like the example above the pasta is a softer texture, with a broccoli for crunch and apple for a touch of sweetness!
Menu planning also makes this tip even easier! If you have a menu all set up then you have everything you need to make your plates look appealing!