Well, to go into detail...
Putting text into a corner is a sign of two things.1, people put their names on sigs that they didn't make, henceforth ripped. 2. It's just not a great place to put it. It doesn't work well with... well any signature at all.
Efficiently... hmm. We could go into lots of detail. Something clever like you said, that goes well with the theme. Like the text, "Wired" with a wire filled signature, or something even more clever. Something appealing, it's just a side text to tell what is it and what's going on. It has to match with the focal, match the background, look appealing, but most of all doesn't take all the attention away from the focal. I haven't gone into full detail, but just refrain from text until you stroll along a tutorial that teaches you more in depth.