I think it depends on where you are going. If you are set on a Navy blazer, I would say the jeans need to be faded a bit to give some contrast. The better option would be to wear nice dark jeans with a sport coat. I have several sport coats in greys, browns, or tans that have patterns and look great with jeans. In any case, I'm not a big fan of jeans in any color other than blue. If you want to wear lighter colors, just stick with trousers.