1. Need to add the ornament to your ornament inventory. 2. Then go to the tree page 3. View source 4. Search for the ornament 5. Look for the png at this address: http://img.subeta.net/luminaire/trees/ 6. Copy only the part after the above address, include the .png. 7. You can usually figure out the names of differently coloured, but the same style of ornament.

[edit] Forget all that. Subeta changed how the ornament hover box displays. Do it like clothing!

Read the above post. Thanks Lypsyl!