15 levels of menorah from top to bottom as brought in Chesed Avraham 

1. Gold
2. Silver 
3. Fine copper 
4. Red copper
5. Iron
6. Tin
7. Lead
8. Glass
9. Wood
10. Glazed pottery 
11. New pottery 
12. Bone
13. Pomegranate peel
14. Walnut shell 
15. Tree bark

If you make it out of a peel or a shell it needs to be made into a recepticle and must be able to stand on its own.
Egg shell gets an honorable mention that it doesn't make the list and that it's not fitting to use as a Chanuka candle 

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