Lady Gaga Heartbeats in rose red, and some Skullcandy's in pink and white.
I LOVE the Heartbeats, they sound amazing, and block out all other noise. Now I just use my Skullcandy's as backup.
I've had shure, senheisser, apple, dr dre beats but the best by far are the Bose in ear headphones. They have the best bass and the clearest highs and mids. All the others I've had were good at one thing but bad at the other the Bose are not perfect but the best I've tryed within my budget.
My favorite are the SkullCandy Ink'd, although not with the iPhone 4...my 2 favs!
Beats By Dre Solo Headphones
iPhone4
Grado sr-80. Amazing. I wouldn't spend 300 on anything monster makes.
I just bought a pair of Bowers & Wilkins P5's two weeks ago and they are by far the best pair of headphones I have ever heard. I listened to every brand they had in the store and the P5's blew them all out of the water. They are not cheap at $300 but worth every penny if you listen to a lot of music. They are made from stainless steel and Australian sheep leather(which feels like heaven). Also, if the cords or ear parts ever wear out you can just get them replaced easily. The cuffs are magnetically attached and the cord has a jack inside. Plus they match my new phone perfectly with the black and stainless steal band. Also have a pair of Custom 3's from Klipsch for my on the go with Comply Foam tips.
Anything from Grado. I use an amp with mine and the quality is amazing. You need an amp for high end headphoes with iphone/ipod for the power. Works good without the amp though too. Picking up earbuds this weekend from them. These will not need an amp of course.