Xenomorph Rek'sai (Skin Concept)
As someone who mains Rek'sai and has watched some of the Alien movies, I think a Xenomorph Rek'sai skin would be great for her to have. Since she is the largest of her kind, she could be the queen Xenomorph with a smaller egg sac.
Rek'sai, when burrowed, would move along vents that are created as a visual effect temporarily. The production of these increase or decrease as she speeds up or slows down.
Her abilities would all have an acidic effect on them.
Queen's Wrath would have a greenish acidic effect. Prey Seeker would fire an egg from her egg sac, and a small creature (Facehugger) would pop out, revealing the enemy for the time.
Burrowing and unburrowing would create large splashes of acid. Tremor Sense while burrowed displays an unreadable distance on a radar stuck to Rek'sai while burrowed.
Furious Bite could have a smaller tongue with a mouth bite the enemy instead of Rek'sai herself. Rek'sai's tunnels would be similar to her default tunnels, but a black gooey substance attached to them and between them.
Void Rush could have visual effects, but would also have a small creature (Chestburster) pop out of the target when damaged or killed with the ability.