The Scrapping Turtle has this fun mystery challenge every month. They gather some scrapping items together in a bag and the challenge is to create a layout using at least one of every thing that is provided. I'd thought about participating for a couple of months before I actually bought my first Monthly Mystery Challenge Kit. The first one I completed was in February -- I created Simply She from the supplies provided in the kit.
I had so much fun participating in the challenge that I also picked up the kit for March. My layout "Wishes" was created from the March kit.
I'm looking forward to picking up April's kit so I can join in the challenge once again.