If I may offer a suggestion out of the box here... what if you used a dark shade of red not to go with the actual hull patterns, but as a stylized splash of blood? You know, like say a wolf whose mouth and face is slathered red after he'd slain a foe. If the romulans can go with looking like birds, the klingons can go with looking like blood-thirsty beasts straight out of combat, ready for more.
While I, personally, have no problem with that sort of thing for small combat craft (fighters, etc)... it would feel "silly" to me to see that on a large capital ship. But that's just me...