My family had an excellent time at the Russian doll painting class, booked through Spbatyourpace.ru (who also publish the most informative map of St Petersburg).
After several days of sightseeing, my kids wanted to do something «different» and Russian. The class was two hours of relaxed fun, in the studio in the north of the city (you can also pick another location in the city centre). Varvara, the pleasant instructor, helped us paint our own colourful miniature dolls, and served us tea and biscuits. My kids were delighted, and now we have our own hand-painted «souvenirs» to take home.
Highly recommend this activity, and the helpful and friendly service from Georgiy at Spbatyourpace.ru.