I've got this great card kit in from Stephanie Weightman which is part of the Classic Christmas range. They're called storybook cards and the kit which is just £7.99 contains everything you need to make 6 of these cards. It doesn't come with envelopes but there is an extra decoupage set for each design which you could use to decorate a custom made box.
Here's a picture of the inside....
So why not have a look at the kit in my shop now, here.
By the way I've got a DT call over on my other blog, Cards for Men. Please take a look and help me spread the word. Thanks