I've done this bulletin board every year, and the kids (and adults) love it! I send out a letter to the parents asking for random items, and this is what I got this year:) The item to search for changes every day.
Boggle- This is by far the most popular in my room. I got this amazing activity from Create-Teach-Share and my kids go bananas for it. I just change the letters weekly to reflect our spelling pattern focus and they go on a word making frenzy. LOVE it!