Google Now and Google+ (Android) both make use of a card-like interface.
Have the same need, and have started investigating a bit. I've been looking at the apktool output I've been able to get from the com.google.android.googlequicksearchbox apk. (no sources only the res xmls)
This layout (at_place_card.xml) is used for displaying a location. It has three text lines and two actions buttons (details and checkin) on the right and an image on the left.
Unfortunately, I am not able to get any style information out from the apk, so the font size, dimensions and colors are just guesses.
Update: Was able to get some style information also now. If you're interested here is a zip file with the information I have currently (some resource files from google now). https://dl.dropbox.com/u/4379928/android/googlenow2.zip