Blue teacups and saucers are often sought after by collectors and can vary widely in design, shape, and manufacturer. They are typically made from ceramic or porcelain and can feature various patterns, such as floral or geometric designs. The popularity of blue pottery can be linked to historical designs from regions like Delft in the Netherlands or traditional Chinese blue-and-white porcelain. Vintage or antique sets can hold significant value, especially if they are from a renowned manufacturer or part of a rare collection.