These modular typography shelves, like Fontable and Tabisso's typographic lounge furniture, could make an interesting accent or focal point in a room (though I don't know that I'd recommend using them all in conjunction).

Designed by Ricard Mollon and available at Quattria, the ANITA shelves put font to work three dimensionally. The set-up is fully customizable and comes in four transparent color options—red, blue, white or black, and are available in wall-size or shelf-height. See some examples below:

And they have an easy to use "Configurator" (which is just fun to say) that allows you to view a detail of your shelf and change options.

I could see single letters used as interesting side tables—from the front they would look like funky lucite tables, and then, moving to the side, the letter appears. Initials hugging a couch perhaps? What word would you spell?

Some other hand-picked posts you might enjoy on our Design Blog:

Fontable: Custom Typography Tabletops Now Available
Typographic Lounge Furniture from Tabisso
The Alphabet One and Two: Video Type Explorations from n9ve