I have been making pattern art since 2013. Google my artist name ONOJK123 and you can see some of my 2000+ finished works. I will make a high resolution pattern art for yoou using open source software. I use GIMP and Inkscape to produce high resluition patterns. I do not produce vector art. Also mycomplele portfolio is on https://www.deviantart.com/onojk123/gallery