How can I get the lock screen sounds from Android 4.3 back? (upgraded to 4.4)
You could probably download a custom Rom from xda and find and extract the sound files from

/system/media/audio/


You should be able to put them into the relevant folder on the 'sdcard'

/sdcard/alarms/
/sdcard/Notifications/
/sdcard/Ringtones/


where they will get picked up by the OS.

As for the notification icons, without rooting and customising the relevant files (I'm not sure exactly which) there is no way to change them from white to blue.