Oh boy, if you're looking for ideas, Artimis is the one to ask. I have a shelf full of beautiful memorabilia, and most of them are her creations, withlionesses, white roses, silver and blue, and all beautiful.
Some of my favorites are wooden blocks with our letters on them, and silver roses (either painted or stickers)...a wooden jewellry box with the image of a lion cub either carved or burnt into it...a blue vase with little silver and white roses (the kind you find in craft stores) in a ring around the neck.
Most of the gifts my sisters and I exchange are crafter (or bought because the item incorporates our symbols/colors)...unfortunately (or fortunately!) because we're so small, we can't mass produce things like caps, keychains, or special order nicer items, without a great deal of expense. But I kinda like the stuff that has a personal touch, it speaks of a great bond and much love!
