Last night I was playing around with my Bold 9000 and noticed some ringtones I really missed. I started exploring options to get them installed on my 9780. I was open to just downloading a select few one by one, but I came across a much easier method that actually comes straight from RIM. There is an OTA link for the ringtone file from OS5 that easily installs the tones on your device. Just hit the link and you'll have a fresh set of OS5 ringtones on your OS6 device. The only catch is you'll have to install again should you reload your OS - small price to pay for having a huge bank of tones. To grab them for yourself just hit the link below from your device.
Source: LaBlackBerry