Tartans and plaids
Arrange colored threads into a balanced, repeating plaid, then get a seamless swatch and a weaving guide.
8" of cloth in 2/2 twill at your thread density. Each pixel is one thread crossing.
These are original plaids. The presets are invented for this site and aren't named tartans. Some tartans are restricted or belong to a family or organization, so check before you reproduce one by name.