This is one of my favorite letter sets because it has a really sweet surprise. The letter set comes with 8 sheets of paper and four envelopes. The envelopes have two umbrellas on the front and say, "Cheerful one day". The larger umbrella on the envelope is where the fun surprise is.
The umbrella is actually cut into the envelope so it's clear. When you write your letter and slip it inside, the design of the paper comes through! It turns a boring umbrella into a pretty patterned one.