This page showcases Fantasy Triumph armies that don't necessarily have any connection to each other, or to any unifying theme with other armies -- they are "One-Offs", unique. That contrasts with groups like Tolkien armies (all built to fit the fiction of JRR Tolkien), or MonPoc armies (all armies in an alternative Sci-Fi world where kaiju combat on battlefield earth involves multiple different factions).
Building One-Off armies is a fun creative process. The pathway to each army is different -- sometimes a single model becomes the kernel under which a whole army congeals, like the sand grain built into a pearl; other times a group of related models catches my eye and then I grab other figures to fit as I encounter them.
All my One-Off armies, like most of my Fantasy Triumph armies (MonPoc excepted), are 28-30mm figures based on 80mm bases.