In earlier versions of Dropbox for Mac I could tweak the Dropbox folder by adding the Dropbox logo as the folder icon. That meant that in my Mac's dock, Dropbox stood out (it's the item I use most often in my dock).
That's no longer possible after the latest update, and the Dropbox folder now blends in with all the other standard blue, rectangular Mac folders. (Yes, I know it has a faint image of the Dropbox logo...but not something one can see at-a-glance.)
Since users can no longer alter the folder appearance, I recommend that Dropbox consider changing the look of the Dropbox folder—perhaps by using its logo as the folder icon—so that we can swiftly and easily spot the Dropbox folder among all our other folders.