Greetings from a hot and sunny Scotland! I'm afraid to say that there's no 'classic' Scottish quilt pattern that I'm aware of. You've had the usual suggestions of Celtic cross (many are actually Irish) and thistle. The Scottish flag - a
St. Andrew's Cross - is a simple design in blue and white. There's also the Lion Rampart in that link, but a bit more complicated, lol.
The most obvious would be something with Royal Stewart tartan - that's the red one you see most of. It's the official tartan of the Queen and therefore may be worn by any of her subjects, lol. The selection of cotton tartan is limited - most tartan fabric is usually a poly cotton mix.
A lot of what you call 'plaid' (a plaid is actually a blanket- type garment worn over the shoulder) isn't actually tartan but actually just check fabric.
I'm not sure if this novelty fabric is to your taste - it's made by Nutex (a New Zealand company - go figure!). Over here it would cost you $15-$18US a metre (39").
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Let me know if I can help in any way
