Grab bag

Winners can choose a gift from the grab bags on the table.

Source: wiktionary

With that system, it's a grab bag which files we can find at any moment.

Source: wiktionary

There were now a grab bag of southern country-rock units with a new wrinkle—Black Oak Arkansas, for one, combined psychedelia, fifties rock, Hindu spiritualism, and gospel into “psycho-boogie,” or “raunch 'n' roll.”

Source: wiktionary

There was no location, really — most of the convention took place in a Milwaukee of the mind. […] Instead, the teleconvention kept a few standards (like the Bruce Springsteen–soundtracked montage) and borrowed from a grab bag of other TV formats, from talk show to cable news to reality-TV reunion special.

Source: wiktionary