Conversation so far:
What are picts of Celtic art?
The Picts were a confederation of Celtic language-speaking peoples.
Were the picts of Celtic art in Scotland?
The Picts shared modern Scotland with a zone of Irish cultural influence on the west coast, including Iona, and the Anglo-Saxon kingdom of Northumbria to the south.

Question: What other art did they produce?
Self-contained rewrite: What other art did the picts of Celtic art produce?