Just a note about the bitless bridles...
Any horse can run through a sidepull; you have no stopping power. I agree with testing how your horse goes in a halter (in an arena!) before purchasing one. They can be great, but not wonderful on the trail unless you have an extensive repertoire and respect with your horse. I find that horses will "respect" a bit and become very aware when they're out on the trail and not wearing one!
That being said, for trails, I have a combination bridle (hehe, I do love my gadgets...). It is a sidepull that can attach poll straps so that it becomes one of those Cook Bitless bridles. Or instead, I can snap on bit hangers and go bitted for a while until my boy settles down. Again, I love my gadgets and having options is just so darn fun... It's the 3-in-1 found here
As for the colors... I don't know! I LOVE expressing my self through funky colors and quite honestly couldn't give a rat's bum about what other people think. ;) It's just fun! Although I always assumed it was perhaps a visibility thing...?