All designs / Backgrounds / Vintage and antique
Marbled cover of an old notebook
Vintage and antique The photo fills the whole card. Your callsign and contact details go on a light or dark panel over it, and you can choose which at the design step.

A sample station on the dark panel, with the photo darkened 25 percent so the writing stays clear. The design step lets you choose the other panel or change the dimming. The bare photo is below.

Photo: "Schetsboek met 37 bladen, RP-T-00-472" by Rijksmuseum, CC0 1.0, via Wikimedia (https://commons.wikimedia.org/wiki/File:Schetsboek_met_37_bladen,_RP-T-00-472.jpg). Free to use on your cards.