Geometric cross stitch


Hi, I would like to stitch this and I don’t know if it is possible but I would like to give the letters a Scottish tartan look (tradition red tartan) is this an effect I could achieve with variegated thread? (I have never used this before) if so would I stitch in rows or one…
I did this cross stitch based on Josef Lada, famous Czech illustrator. It’s 11×14 and it took me 6 months, working on it in the evenings. The painting is called : Night watchman and snowman.. I love the folk art.. I framed it myself, so it’s not perfect, but it still came out nice (I…