I wrote to them to see if I could review a product, and it literally took me a long time to find one that would be awesome for the office. I was between two choices: this pad about why I'm in a bad mood for the day (inside joke in the office) or the bathroom guest book. I went with the bathroom guest book.
You need to explore the knock knock site. It's awesome. There are so many choices to choose from. Some of my favorite items on the site are:
I Gotta be me Journal
Why I'm in a Really bad Mood Pad
These are just a few. There are much more. If you're looking for something fun for the house or the office, you really need to check out Knock Knock Stuff!
They are on facebook, and twitter. Have some fun!