At the top of my list are my Vintage Grace square platters. I love these things.
I use them as a charger for candles and decor on my dining table, coffee table and such. I change the candles, rings, etc for the season.
I use them for their intended purpose, as serving platters.
I use them as a base for other decorative uses. At Easter, I put a vintage looking stuffed rabbit, with eggs and ceramic birds.
I've used them as a backsplash of sorts, in a rack on the kitchen counter when I wanted to use them to set off something placed in front of them.
I think the only room I haven't used these in is the bathroom, and that is because we have very tiny bathrooms, with no counter space. If I had counter space, I'd use them to arrange nice cosmetic bottles, etc.
What TT have you found to be the most versatile, and moved beyond the kitchen with?