
BuwaroElexion666 |

I would imagine you can make some wooden spiked shields, too. Also, you could use a Klar. I think it came out in UC, but I have the UE book right here and it is as follows
The traditional form of this tribal weapon is a short blade bound to the skull of a large horned lizard but but a skilled smith can craft one entirely out of metal.
I don't see why you cant just replace the blade with some bones and call it a day.
Edit
Also I forgot to mention the UE book states you can use bone for wood or metal, so now I am thinking for sure you can make a bone spike shield, just be ready to enchant or replace the bone alot... lol.

Adjule |

A spiked shield is considered a weapon. So long as the shield is wooden, the spikes can be metal. A druid ONLY loses her special powers when wearing forbidden armor.
Relevant text:
A druid who wears prohibited armor or uses a prohibited shield is unable to cast druid spells or use any of her supernatural or spell-like class abilities while doing so and for 24 hours thereafter.
No where in the druid Proficiency section does it say they lose their Su and Sp abilities by using a weapon not specified in their proficiency section. So, you could be a greatsword-wielding druid if you wanted. Same goes for armor spikes (since they are considered weapons).
The prohibition is on ARMOR only. So you could have metal spikes on your shield and armor and be A-OK.
Of course, this is my interpretation on this, as I am unsure if there is an actual FAQ on this.
Edit: Seems I was a bit slow and BBT got to it first.