I love the little two-toned flame graphic for streaks. Every time it fills in, I think it would be fun to adjust the feature so that if you only read a portion of your streak goal (10 pages instead of 15), then only the inner, light orange part of the flame would color in. (Right now it just stays empty if you partially meet your streak.) When you meet your streak, it colors fully as usual. It would work as a nice visual reminder that you've started but still have a little way to go.