She said the television adaptation of Hilary Mantel's Booker-winning novel and the Duke and Duchess of Cambridge's forthcoming second child are "perfect timing" for the products, which launched at Glee in 2014.
Briers is also working with Greenfingers on a glove promotion featuring "gluvvie" pictures on Twitter.
The company is increasingly employing former retailers such as Nick Walton and John Moseley from Garden & Leisure as well as Tristan Sissons, formerly of Wyevale Garden Centres.
Briers is the UK's only member of the European Floral & Lifestyle Suppliers Association, which it said helps with trend watching.
The firm has been exhibiting at Spring Fair, aiming to take ranges such as Gruffalo into the gift market. It has won new business at Hillier, Prosper Group (Knights, Forest Lodge and Stewarts) and makes own-brand products for Wilko, Homebase, Waitrose, B&Q, Wyevale, Blue Diamond and Dobbies.