Let's review the options. The street light and street sign/stop sign are untouchable. They belong to the town. The cable box perhaps could be painted a better shade, but I doubt that would help. Cheesy fake boulders and their ilk would make things worse. Wooden lattice screens seem to scream "Look, there's a cable box under here!" In fact, covering the box at all is complicated by the reality that "they" - those mysterious figures from the various power and cable companies - may need access to it at some point.
At least I am not alone. Online, one very frustrated mischief maker went so far as to recommend that the offending cable box meet with an unfortunate "accident" in the dead of night, thus spurring the power company to replace it with a newer, sleeker, and (presumably) more garden-friendly model. This sounds borderline illegal. I'll pass.