How to ‘pretty up’ an ugly piece of industrial design for electronics

Allow me to apologize in advance if this question is too far out for the UX site.

Here is a generic box for electronics:

As you can tell, this won't be winning any industrial design awards. However, it is similar to a box I have to work with, and I have to improve the perception it will give to an end user of the brand's quality, technological capability, and modernism (despite the ugly exterior, the capabilities within are powerful).

About the User: These boxes are going to be sitting on office workers' desks (or somewhere nearby). It isn't for consumers. It also isn't a box users 'interact' with at all except for a couple of LED lights that indicate that it's working.

The constraint: we cannot change the shell (this picture is the actual box we have to use), and we need to make each box look as good as possible with very little expenditure and very little assembly time.

Approaches we've thought of so far:

• Add a brightly colored company logo
• Add dark stickers, possibly subtly patterned, possibly over the gaps on top, to give a cleaner and more modern look.
• Spray paint the whole thing with a rubberized coating then put a decal on top of that.

I don't know what the options are - we've thought of accent labels, background labels, and rubberized coatings. What other avenues are possible to improve the user's experience of a box like this without changing the shell itself?