You could find SPI example under CW v10.4 folder:
C:\Freescale\CW MCU v10.4\MCU\CodeWarrior_Examples\Processor_Expert\Kinetis\TWR-K21D50M\SPI
you can obtain samples in our website, regarding a development board for this part, you can use TWR-K21D50M which is available in our website too.
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=TWR-K21D50M&fsrch=1