Those will keep for a while, if you keep them in a biscuit box or some other suitable container.
This is very easy to adapt for variants. The cookies I made for Eastercon, which are the ones pictured above, were made by replacing the chocolate chips by 100g chocolate, which I melted with the butter. You can also vary the garnish, of course: I've used raisins, berries, other nuts, peeled and candied oranges... Whatever you feel like. I usually replace in equal volumes, so about 3 cups of garnish all in all, but your mileage might vary.
I do like to keep the oats because it keeps the cookies crunchy, but they're not compulsory either.
And now I'll leave you, as I'm about to try a dangerous cooking experiment--namely, replicating something I once ate in a restaurant...