Hear me out here. Tyrande is the chosen of Elune. She's been leading the night elves in war for who knows how long. Her position as a religious figure in the night elf community is very telling to her reverance to nature, and her ability to control the masses. In fact, there's a nice little easter egg in Chapter 2 of Warcraft 3's Night Elf Campaign, Daughters of the Moon where you can find and command a zerg hydralisk. Now, that isn't canon, but neither is anything in Heroes of the Storm, so this is something, when proposing that Tyrande have an infested skin akin to Sarah Kerrigan.

http://wowwiki.wikia.com/Zerg_Hydralisk

It wouldn't be the first crossover skin, but this already has a basis.

I used the official concept art for Kerrigan and Tyrande as reference.

Replaced some of the jewels in her armor with the zerg symbol.

Not replaced jewels could be eggs, or the sacks you see on queens.

Replaced Tyrande's hair and cape with Kerrigan dreads. Opted to removed ponytail on account that Kerrigan had one as a ghost as well.

Tried to conform zerg formations around the armor from Tyrande's concept art.

Replaced owl with a scourge.

Bow was based around Kerrigan back claw and a mutalisk. Strings presumed to be "natural fiber". Maybe mucus.