This can be in any form you wish, faux stitching, hand written or drawn elements on your card, zentangle. As long as you create something with 'ink' by hand
I've often looked at Zentangle and must admit it fascinates me but I've never had a go - so............... here's my effort today. Definitely not perfect but don't think it's too bad for a first try. Might have another go during the week if I've got time. I used a double ended black Sharpie; ultra fine and fine tips. The sentiment is Stampin Up Pocket Silhouettes.