To help you prepare for the upcoming hackathon we have prepared a page that will connect you to lots of supporting material (yes, including some are ready made apps). As the images show, the content is aligned to make it easier for you to focus on features that you may want to use for application.
We will also make available TI Sensors should a team want to develop an IoT application.
IBM Bluemix Guide - with samples to help you get started for tmforum{open}:hack
TMF API BlueMix Guide
TMF API BlueMix Guide for TMF and FIWARE APIs
The document has examples for TMF and FIware APIs exposed in Bluemix.
BlueMix Mobile Back End as a Service
The MBaaS zip file is a detailed example of a Mobile Back End as a Service