On my New York Oceanic feed, each & every every aircraft inbound for landing is always given something similar to the following: "Descend pilot's discretion 5000". That clearance gives the pilot clearance to start descending, whenever the pilot would like to, down to 5000 feet. Some aircraft would start descending immediately, while others delay their descent, hence the "pilot's discretion" part.
Similarly, transiting aircraft often need to deviate slightly from their route due to weather. In cases like that, they're given a clearance simalar to: "Deviate left or right of track 10 degrees at pilot's discretion; direct DASER (or whatever waypoint they were initially heading to) when able".
There's of course other instances too, just that the above are heard all the time on my feeds.