I took a peek into your message history and see you're sewing for a boy, I'd definitely use neat color combos to liven up pants and other things.
Spring green with Tuqouise blues and dark purples look great together. Or brown instead of the purple, with some red accents tossed in there.
Or pale yellow and blue with deeper browns and oranges, that kind of thing.
I'd use different colors to add interest with things like pockets, piping, appliques, belts, contrasting topstitching, buttons, maybe a little stencilled print or embroidered outlines over prints. Maybe not all at once, hehe, but whatever seems pleasing at the time. I'd try to keep to one major color or maybe a multi color pattern and keep the other colors as fairly small accents.
Just, whatever you dream up, go for it! It's nearly guaranteed to be more interesting than the stuff they're selling at your local clothing store.