You could do a straight line cross hatch on the two Christmas runners. You could also outline the squares on the batik runner. That would be quite easy to do. You could use clear filament thread on the batik runner so that you would not have to worry about colour matching. FMQ seems to be really easy for some people and truly difficult for others. I do not think I would like to make these beautiful runners into my 'first ever' or 'practice pieces'. But that is just me.