I have one in a magazine, I think it's paper pieced, I could copy it if you yell loud enough!
One thought though, your friends mum is Japanese, will she really want a gift that is Japanese? It seems people tend to prefer a gift that relates to either the country they are visiting, or the nationality of the giver. So I think she'd prefer to receive a Scottish themed gift - a gift that matches someones nationality if a good choice when they've been away from home for a time and it's giving them a reminder of home, particularly if it's something that's more expensive and they couldn't justify buying themselves, so for example if I had a Japanese friend who I thought was feeling homesick, I'd go to the local oriental store and buy sweets/snacks as a token gift to bring a smile to their day.
That leaves the question of what would be something you could quilt that related to scotland? maybe a paper pieced loch ness monster!
Cheers Anne