Use pattern overlays in programs such as Adobe, Affinity, Corel, Photopea, Gimp or Procreate... to name a few.

These overlays are currently not suitable for editing in Canva.

Apply color, texture or gradients to the pattern overlay or the underlying background. Combine patterns for interesting effects.

Apply multiple colors using the select tool. The possibilities are truly endless.

Unlimited commercial use allows you to make as many designs as you want. As long as you make finished papers and are not re-selling the overlays in a competitive fashion you are free to make any design creation imaginable. Get creative, have fun!