Easy peasy then. Like I said figure out where everything needs to go and get some cables that are a little longer than you need. (For example if its 6 feet get 7 or 10 feet so you have enough for a service loop). Run everything where it needs to be and make sure nothing is tangled up (so no cables overlapping if you can avoid it). Once everything is where it needs to be start at the patch panel and tie the bundle together as you go. You may get to the point where you have a few cables split off from the main bundle and thats ok. Tie the whole bundle where the split happens and then tie each of the splits there too. Keep doing that until the entire bundle is neatly wrapped and managed. Then you can take up the slack into a service loop. If your rack has square holes you can tie the cables directly to the rack by running your tie through one of the holes and then wrapping around the bundle. If your rack has round holes you may have to get a little more creative if you're using velcro. That last bit is really going to be the key to making things look good. You could do it the same way and just let the cables fall straight down but it wont look as nice and it'll likely be in the way