You may enjoy this book, which you can find at archive. org, Songs and Tales of Saint Columba and His Age, (1897?), Pub. Geddes, Edinburgh. It includes the writings of Fiona Macleod, nom de plume of William Sharp (1855-1905), and has a lot of interesting material in terms of Scottish and Gaelic lore. You may particular enjoy The Festival of the Birds (in this same book), in the section Marvels of Iona.