With Patch 10.0.7, the Orc Heritage questline is available for players, and one of the rewards of the questline is the Clan Banner toy — A toy that allows your Orc character to carry the standard of your chosen clan. One of the motifs during the Orc Heritage questline is being able to choose your Clan once more as an Orc who comes of age, and as such, you have 6 clan options — Each with their own standard. When completing the questline, your Clan Banner toy will use the standard of the clan you chose during the questline.
Blackrock, Bleeding Hollow, Dragonmaw Frostwolf, Shattered Hand, WarsongIf you want a new flag, or just grew bored of your old Clan, however, you're able to change your clan. To do this, you'll need to return to Razor Hill in Durotar and speak to Envoy Korg inside the barracks building, whom will offer the option of swapping clans. This will change the flag from your Clan Banner toy!
Read more on wowhead.com