Thanks for putting your suggestions in my box, Google.

Click the picture above for a Google-generated visual typology of suggestion boxes.
I love suggestion boxes — especially the ones that look like mailboxes. (Bob Evans used to have that kind, complete with raisable/risible flag. Do they still?)
On the subject of suggestion boxes: Joe Wenderoth’s Letters To Wendy’s is a tremendously fun novel, narrated through a staccato series of Wendy’s suggestion-box comment cards. Highest recommendation.
BONUS: illustrated 1989 patent for a “wheeled storage and display cart” (a.k.a. suggestion box)
AND: A trove of stock-image cartoons based on suggestion boxes.