I wear blue trousers quite a bit - cotton or light wool in summer and corduroy in winter.
In summer - wear with tan, sand, light brown, grey or light blue jackets in linen, cotton or light wool.
In winter - wear with chocolate brown or grey herringbone weave jackets, or check jackets in tan or brown with a blue check.
That's my preference, anyway.
Here are a few (rather bad) photos of mine which might give you a little bit of an idea of some possible combinations.