Originally Posted by Rayven
Continuing from Lima's post.
When we realized the ability icons were confusing, we even tried to simplify by either showing whether it was an ability or attack which dealt the killing blow.
Ultimately, that's not the most important information to convey (pretty irrelevant actually), so we went with kill, streak, streak ended.
Someone else mentioned using fire and ice to signify streaks and streak breaking respectively.
A kill could just be a sword, maybe a bloody sword.
Maybe you could have the portrait of the portrait of someone on a streak on fire, possibly correlate flame size/number of flames with streak size, and then have a broken kill streak have ice/frost around the person who's streak was broken's portrait. maybe something along the lines of say, the font used on an Ice Age 2 image (the blue/whitish one, GIS should spot it pretty easy).
Regardless of streak status, you would have the sword as the icon with only the portraits of those involved indicating streak/break status.