I have a zombie horror type plot i mull over in my head occasionally
bu i hate scary films / books so i'd never do anything abou it..
I think books about people taking their clothes off (in the presence of vikings / romans / crusaders) seem to sell a little better than your existential dread ones nowadays... worth bearing in mind.. get dotty to illustrate it.
I am best at prose - I need a vague plot and I can then develop dialogue and story well
I tend toward the wryly amusing, if I am honest.
I just need a plot.
Vikings are fun - I could do an historical novel I suppose - then the outline of the plot is already done.