I agree with ShadowMan, tier 1 looks perfectly fine imo, but the tier 2 is too big. Also maybe there could be some pollen coming out of the flowers in tier 2 for some extra impact kinda like how the current kill streakers tend to add an extra element when they level up.
I like the idea of some new killstreakers, especially with the potential of new MVM tours. d:

Shrink the flower petals down just a hair bit, then it'd look a lot better.

Actually insane how creative this KS effect is. Nice job