It is a long, long ago established fact that trays are storage superheroes.
I would go so far as to make the claim that there is nothing else whose chief purpose is to corral items in a space that is as versatile or as instantly transformational as a tray.
Without a tray, a bunch of objects sitting out in plain sight appear messy and accidental. Without the spatial-defining borders of a tray, a group of items sitting out invite the accumulation of scads more items–though the latter group certainly does not belong out.
But you plant a tray down and bam! Legitimate, on-purpose, official resting place for a considered group of items established.
In short: sans tray = sloppy, tray = intentional. And the difference in appearance between those two is nothing short of magical.
Use them in the bathroom (especially if you lack a medicine cabinet/drawer conducive to storing taller, cosmetic bottle), in the kitchen (as an intentional, non-clutter inviting method for keeping cooking essentials at hand), in the office (as a purposeful way to gather and display tools you use constantly), and virtually any other place in your space.
6. mirror tray
10. onslow tray