I am looking for a new pair of flats to wear with jeans.

The jeans that I have are dark blue denim, white, black and tan. All the flats I have now are black, brown and burgundy. I see lots of fun colors out there but not sure what color goes best with my jeans. I am looking for just one pair (that will be a challenge) so color has to "go" with all.

So - What color flats would you recommend for spring/summer?

Thanks!