Here are some Hair textures.
I used Blender for the Hair strands, but had to render them in UE with the Baking Toolset (Thanks Autodesk for a not working RTT feature <3).
They were originally 9000x9000px and i needed to downscale them for proper AA and even now they look like ****. But I guess people can use it for prototyping.
The Root fo the Hair is always on the upper end.
(click for full images)
Root-Tip (Black is Root):
Packed Opacity (R) Root-Tip(G)