I have created some seamless patterns in corelDRAW. However, the patterns are not ACTUALLY seamless as I can see a tiny white line between two square objects. Is there a way to get rid of that tiny hairline-like white line so that the pattern looks actually seamless?
If you like to design patterns from scratch, one low-cost idea: http://macromonster.com/product/alexander-penkins-symmetrical-2/
You can quickly create Coreldraw .PAT pattern files for later use.