Under Construction is a color scheme for WordPress Admin, using strong blacks and garish yellows. With stripes.
This is of almost no use whatsoever. What little use it had at all was in the development process, where I learned quite a bit about WordPress' Admin design, and about the ways you can torture CSS into doing all sorts of things. What use it may represent to you is beyond my capacity to guess.
Unlikely. All the plugin does is add a color scheme. It might annoy you, but that's about it. Usual caveats apply, and if you don't know what the usual caveats are, give me your username and password.
The metaphor of construction is commonly used when developing websites, though not often so literally anymore. There was a time when developers felt the need to remind their visitors that a website was never a finished object, that it was perpetually 'under construction'. That time was 1996.
A man apparently called Photo asked whether anyone had developed color schemes for WordPress 2.5. There were no immediate responses, and he seemed depressed and lonely. Plus I wanted to learn about the Plugin Directory's system without having to finish a plugin that actually did something useful.
The foobarity of the color scheme has been assessed independantly at approximately 0.3, though you may have to recalibrate your monitor to repeat that value under real-world conditions.