OliveYou're right, the paper itself does not have a pattern, so this is in reference to the envelope liner which is inside the included envelopes. (Also the decor on the box) Hope this helps!
SkipPpReally well, actually. When I tested these samples out, I used the LAMY Joy calligraphy pen seen in photos, with the included LAMY cartridge. There was no feathering or bleed-through on anything, and very minimal ghosting on the letter paper (so you could probably write on the back without issue with most pen/ink combos).