Made with Bibo Smooth and YAB Buff normals, if you want to make it for other normals use .psd file
If you want to change color go to: Advanced Editing > Materials > Select one with light green text > Material Constants > g_EmissiveColor.
Feel free to distibute/edit.
How to use PSD: The womb tattoo itself is under the "Channels" tab as an Alpha channel, there is no base/diffuse since this is meant to only show when glowing. Do be aware that you MUST have a program that can save the normalmap with it's alpha channel intact since Photoshop isn't capable of this by default.