did u root ur device after unlocking it?
if not! start with this
if yes! then go to http://xdaforums.com/showthread.php?t=1341127 download the recovery image from the website, put it in the tools folder u have used while unlocking, reboot ur phone in fastboot (remove battery > volume down+power), open a cmd on ur PC, go to the tools folder
type in:
fastboot flash recovery r1-recovery-clockwork-5.0.2.7-modaco-runnymede.img
(tip is to type r1 then hit tab to complete full line without typing it all)
that's it for flashing the recovery image!
then go to the development section to choose a ROM to flash it on ur device.