This is the pattern chart for an intarsia knit showing the TV test pattern from the 80’s.
I used the chart into a sweater, but would be perfect for a pillow cover, too.
I designed the chart using Excel.
This is for a rather thin knit, but could be knitted in thicker yarn, to obtain a larger design.

This was knitted on my brother KH860 knitting machine, and the gauge was obtained with tension 6.
The pattern can be also hand-knit. actually I made also a hand-knitting chart (see blog link)