Design the back of a Bicycle brand playing card with a 'pattern' theme.Represented by a seamless repeating design, including everything in a 9:16 size white borders without any kind of drawing or letters or numbers

Negative:Do not include numbers or card signs such as hearts, spades, rhombuses or clubs

Nota: donde dice"patter" teme , lo cambie por ejemplo por castillo medieval o lo que se te ocurra y tenes otro resultado

Si manejas Photoshop, solo creas el recuadro dentro y vas rellenar con motivo, elijiendo uno que sea "patron sin costura " o pattern aca por ejemplo hay muchos diseños, florales en este caso;
https://www.freepik.com/free-photos-vectors/floral-pattern