Thanks for the nice comments, mates!
Recipe for a slightly complicated tartan in 28 mm:- get yourself in the right zen-mood with a beer or two and relax; some cool background music can't harm too.
- study a picture of the real thing: what kind of stripes in which order on what background colour?
- take a fine-pointed brush (I used a 00) for the lines and ensure that your colours are nicely thinned with water for a smooth flow ...; a consistence like milk is what you're after.
- paint one or two thin coats of the background colour (a Foundry dark blue in my case).
- take the fine brush and paint the first array of lines (a dark green pattern of even-spaced vertical and horizontal lines).
- try to be as neat as possible; any crude lines can be corrected easily later with the background colour.
- with some light green colour paint a small square where the green lines cross.
- now comes the fun part: paint a thin black line on either side of each green line!
Well, you can try that, and some years earlier I could have done it, but today we have technology from Japan: a ultrafine Gundam marker, see here
http://www.gundamstoreandmore.com/gunmargunbla.html- let the Gundam ink dry some time and paint a thin red line in the middle of each green line.
- paint a lighter red dot where the red lines cross.
- paint a thin off-white line
between all green lines.
- paint a pure white dot where all the white lines cross.
Seal and varnish.
I know that sounds terribly complicated, but believe me, after some practise and in the right mood you can finish this in two hours. I wouldn'd do that for a regiment though ...
Here is an extreme macro shot of the tartan to see all painting steps; please keep in mind that at this enlargement most lines look terrible ...