So another theme that came to my mind is Scottish wedding. Why not to have that as a your theme for your wedding if you are getting married in Scotland . As well it might be a good idea for your wedding if you or your fiancé is from Scotland. It could be a great theme where you can use a lot of traditional motifs to make that beautiful. Main colors that you will use be red, blue, black. The main motif that will be used during your day will be a Scottish tartan than can be used everywhere where is possible. Even your dress can have that motif so maybe you will decide to not have a white traditional dress. And the best place to get married is Scotland, maybe your big day will be in that beautiful place with plenty castles.
Please find below my ideas that I found for wedding, maybe that will help you to plan your big day.