I've dabbled into modding and such before but I have found the work flows and the limitations of non-open source games to be very limiting for what I like to do.
I'm going back into working with Unreal 4 and Cryengine and going to start on a new project in which I hope to recruit a few volunteers. The plan is to remake Quake 1, keeping the old spirit of early FPS with level design and monsters that hold up to modern day standards. It's personally going to be a fun project while job hunting but planning it out might be a somewhat challenging task to begin with.
I'm no environmental modeler or designer but it's going to be a nice change from doing characters for a bit.