I have noticed when looking at old photos that there seem to have been many more patterns for tallit striping in the past. As there seem to be only two major manufacturers (Talit[a]nia and Mishkan HaTechelet) the modern array of patterns seems much smaller. Is there an archive which shows some of the older (pre-war?) tallit patterns, as well as any alternative modern ones?
Does this link help? It stands to reason that there used to be more variety since you had fewer major tallit makers, more small tallit makers, and more localized commerce.
I sell a whole lot of Mishkan Hatchelet talleisim (I don't work with Talitania much), and you're right, their standard black-striped designs have very similar patterns. What I personally find tedious is that all standard ataros are identical.
Of course there definitely is some striping diversity, e.g. Turkish, Chabad, Yemenite. Also, Mishkan now has a Belz tallis that has super dark blue stripes.