DIY "Wire-Keeps" foam wire keepers made easy. Here's an easy cheap fast way to get customizable cord control. Perfect for that speaker wire that hangs at your feet under your desk. I have been repurposing a lot of my interlocking foam rubber floor tiles. You can get them in many colors, but gray is by far the most popular. I think gray is the "new black" for foam rubber tile.
I did think of the idea and searched the net and I did find the product available. As it turns out, making the item is pretty easy!
If you would rather order them I believe you can get them via Amazon for about $7.50 shipped (believe this is for package of 16).