Good morning Carl,
You will probably find this website of use / interest -
http://www.pictishstones.org.uk/
As it is thought the carvings were made c. the 7th century AD, they are too recent to be given their own pages on TMA. I appreciate you could point to a range of pages on the website that probably fail to qualify under this rule. But as a category, Pictish symbol stones are too modern.
You may find that some prehistoric sites were later reused by the Picts (for example, Craig Phadrig).
Thanks,
TMA Ed.