What do you suggest kids can wear?

[bendable glasses frames]

It is really a tough time for me to choose eyeglasses, especially for my kids, they have many special request of their eye wears, not only functional but also fashionable, I know there are many solutions to solve this dilemma, such as: the frame shape should contrast well with the face shape, the frame size should be in scale with the face size and eyewear should repeat your personal best feature, but I still cannot figure out what exactly should I choose, for example, my son have a round face shape, what kind of frame can best fit him?