I'm not real familiar with the style, but you might have some luck searching around for "techwear" and "technical workwear". Those pants remind me of stuff I've seen in that realm.
A quick search turns up the company Truewerk and they have some that look similar and have the extra pockets and similar details.
There's stuff out there, but it is harder to find. It's going to be especially hard to find right now. If you want more colorful clothes look again when the Spring and Summer looks come out. The Winter styles are going to be more muted and less colorful.
I like Bonobos and Todd Snyder for when I want something more interesting. Although Todd Snyder is definitely caught in the muted colors for winter thing.