i made 20 weird looking alien textures,most are organic style.

i used some of my textures and various CC0 textures from yughues like this as base.

then i used krita and gimp (krita has a lot of different layer blend modes). with other operations (mainly for colors) i adjusted the rest. normalmaps are done with the gimp plugin insanebump.

some textures have an emitting effect / emitmap