Custom QR Codes design for a wall poster

Design 4 custom QR codes with our Google Places page, FB page, Twitter Page, and Foursquare checkin. For examples of what I am looking for, see this gallery [login to view URL] The individual qr codes do not need to have a different design - i.e., twitter and fb page can have the same design but different qr code. The codes will then be placed in a 16"x20" poster that would consist of our logo, and 4 codes encouraging people to checkin or review on Google Places, etc. Please show examples of previous qr codes work.