Thinking of black forest cakes and the sprinkles that go all around the outside.. I want to do the same kind of thing, but with walnut bits.
How would a put a bunch of chopped walnuts onto the side? The icing is likely going to be a banana cream thing made from whipped cream, sugar, milk and banana jello-pudding.
You put your nuts(crumbs , sprinkles, etc.) in a shallow pan or bowl on the table to your right. Hold the cake in your left hand, without the cakeboard if possible, hold it close to the nuts. You then take a handful of the garnish in your right hand and with a somewhat open hand , hold your hand next to the cake and rotate the cake "and lightly push the garnish onto the cake around the side. You will have to adjust the cake to go around, grabbing more garnish as necessary.
I do it in my sleep but to describe it is harder!