The process of obtaining these runes for decorative purposes is brilliantly described in an article on the Tibiafanart website. We can obtain them during the mission The Great Hunger. Let me quote part of the article:
Recently, player Missy Mystique discovered that we can trivially pick up as many runes as we need from NPC Ghorza! All we have to do is pull them out of our backpack so that the NPC thinks we don’t have them (putting them back in the depo, or putting them on the ground) and write: “lost ogre runes” or “lost runes”.
After each such dialogue, you will receive one more part of the rune, and thus by asking for it 5x, you will gain a new set.
You can get more information in the article on these runes here:
Ogre Rune Stones – Tibia Fanart
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