Peace of Pottery- which is located at 9838 Libera Ave in Manassas just across from the car wash.
Peace of Pottery is a lovely, inviting space. It's not a cheap afternoon- we spent $45.92 for two mugs, so it was perfect for a one-on-one day, but isn't something I'd just do on the spur of the moment with all three kids (which would have put me closer to $100 assuming they'd all picked mugs and not something bigger). Pottery parties, on the other hand, start at $19 per person, so if you have a large group of kids you'd like to take, that could be a great way to keep your costs a little lower.
We definitely had a fun time and enjoyed the laid back, peaceful atmosphere. I'd definitely recommend Peace of Pottery for a fun afternoon or a great venue for a party if you've got a kid with a little artistic flair!
Disclaimer: We just went to Peace of Pottery. Nobody invited us or asked for a review. All opinions are our own.