So I just scribbled down some notes on the physical representation of the exval, the Accord on Trade’s exchange currency:
Exval notes are denominated in powers of two, from 20 through 27. Of these, the 1 exval and 2 exval notes bear a line-work drawing of the seal of the Conclave of Galactic Polities, and a stylization of the opening paragraphs of the Accords, respectively, while the 128 exval note bears a similar line-work drawing of the Conclave Drift itself.
The five middle notes, however, the 4, 8, 16, 32, and 64 exval notes bear designs representing and selected by the five Presidium powers, although in the same line-work style; and to avoid giving any sense of precedence or priority, which design is applied to which note is rotated for each printing, although the dominant background color is not. (The confusion this causes among visually-oriented users of the exval’s physical currency is widely considered an example, among libertists, of how politics prevents us from having nice things.)
…you can pretty much blame the Leagues for that, incidentally. (The Empire taking the position of “oh, ffs, give us the one, we know that we’re awesome and that this argument is petty”, the Photonic Network having no use at all for physical currency, and the Echelons, while not immune to the lure of this sort of thing, being quite prepared to chill at least to the point of abstaining.)
But the really big political argument at the time was in the League of Meridian, over whether they wanted the sixtyfour (the highest denomination, value- and hence status-wise) or the four (of which there are the most around and thus get your design seen, whereas the sixtyfour is about as rare in use as the $50, or maybe even the $100).
…at least it kept the Senate and Congress of the League Assembled out of trouble for a couple of weeks.