Walls are rather dull...
just standing there... all holding up the roof 'n stuff.
Custom routered letters and shapes of your company logo or pretty much anything else, look fantastic!
So do back lit version of the same thing. Words or phrases as cut vinyl decals in all types of finishes also make a fantastic attention grabber.
You can even put up wide format prints of just about any image. Why have a small diploma in a frame when it can be the size of a wall?
(normally used when impressing classmates who said you'd never finish highschool)
Have some unappealing glass that has a curtain or a blind? Replace the blind with custom cut etch vinyl for privacy and coolness. Check the Window section for more.
The fact is that interior spaces have us in them for pretty much most of our lives, and they're pretty bland about it, so why not make them more entertaining for you?
Floors aren't any more exciting either...
...just lying there.
You can use images to give the illusion of height - like in the Loony Toons days of putting a "hole" down you can escape through - or the colours of a dance floor, or any advertisement you wish really. You could even just lay a colour or print down to cover a bland concrete area.
There's no limits really.