From ancient times to right now, mosaic has been a popular form of artistic expression. This gorgeous seahorse is a detail from the floor of the Roman baths at Bath.
Of course if mosaic is your thing, that doesn’t mean you’re limited to ancient motifs. You could go a lot more modern.
How about reproducing a great work of art, like one by Vincent Van Gough?
Or maybe a bit of pop culture:
And of course there’s nothing to limit you to working in ceramic tiles. If you doubt me, take a look at this amazing photo mosaic of Olympic Gold Medal swimmer Michael Phelps… entirely composed of photographs of Michael Phelps: