Oh man do I love this idea

genius

#3 almost looks like an art installation.

If the cables have flat alternatives, just use the flat variety. (ie: flat ethernet cables)

If they don't and you don't want to see it, I'd rather run a small conduit than deal with cables.

But if you've got the freedom, the best solution IMO is to get rid of the cables to begin with. #1 and #3 could be solved with better in-ceiling lighting. #2 could be solved with an extra outlet in the room. (and while the drywall is out for the electrician, you could run some ethernet/coax/etc) #4 could be fixed by running cables in the wall or putting the playstation in an entertainment unit.

love 1 and 2...the rest is a mess

I love 1 and 2..

OMG the number 1 is PERFECT. In the number 2, I like the contrast between the wall and the cable.

pandamonium54, while I agree with you - in some respects - hiding cables properly is not always viable, especially in rentals.
And while I love overhead lighting, they can cause a lot of insulation leaks between levels in a house or damage older houses (who wants to add overhead lighting in a 1920 craftsman?) especially if the house is plaster or has been restored. They don't offer the softest light either, so even with overhead lighting, we have a lot of table lamps as well.

And I also think #1 is absolutely fantastic. And this could be done in such cool ways in a music room or with a very modern design.