Soon every iPhone 4 owner will have a free case from Apple hitting their doorsteps. (Many have already even gotten theirs.) But not everyone may be content with the choices offered. In fact, some may be wondering if there isn’t something better out there, something even more worthy of that sleek glass-and-steel handset. That leads to an obvious question: How do you take one of the sexiest phones on the market and make it even sexier?

If “clothes make the man,” then a great-looking cover can definitely turn a cool device into something hot. So what are my qualifications for a sexy case? It ranges, from clean lines to a curvaceously appealing form factor, or some finger-friendly texture to a luscious pop of color. But whatever it does, it does it well. I handpicked these five items to maximize the jealousy of others over your iPhone 4, so take a look to behold the beauty.

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Element Vapor 4 case — $79.95

Let’s start with a case that boasts a very sleek appearance. Not just gorgeous and unique, but it’s also light weight and a definite step up from the Apple cases, which will no doubt be swarming the masses as more people get their free Bumpers. There are only two color options right now, in black/black and black/pink, but more colors are in the works, so be sure to check back to the site for updates. Click here to pre-order one online with an August ship date.

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iLuv SENTINEL Metal Case — $29.99

We covered this case when iLuv announced its lineup, but I would be remiss if I didn’t mention it here as well. Shiny metallic tones married to a curvy exterior gives the iPhone 4 some “bling” just by slipping it on. Your choices of color includes gold, chrome, titanium and bronze.

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Grove Bamboo Artist Series — $69 – $89

Not into a metallic case that looks like it was forged from a spaceship? If you’d rather keep your style firmly planted on Earth, here’s an eco-friendly option that boasts the beauty of bamboo. In addition to the sustainable material, there is also a metal ring that lines the front of the case to keep the phone firmly in place. Choose from 16 different designs or customize with one of your own. Best part? It’s got smooth moves: Unlike other cases that require you to fumble around with removing it before docking (that’s not sexy), you can just pop off the bottom part. Allow 6-10 weeks for order (plus an additional 2 weeks for customized cases.)

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.Incipio Feather Case — $24.99

Maybe you want barely there protection, but need something more than a skin. At less than 1mm thin, the Incipio Feather polymer case is the epitome of sleek. And for a case that’s so slim, it can pack a serious style statement: In Black, it’s hardly noticeable on the device, but metallic Tonic offers a heavvy metal hardware look. Or pick a brighter hue, like this Lemon-Lime option (above) for some extra eye-popping flair. There are 12 colors to choose from, so customers will surely find a case to match their style.

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Seidio Innocase II — $29.95

This Seidio case has some of the best attributes of the items above in one package. Not only does it offer a snug fit for the iPhone 4, but it’s lightweight, has a two-piece interlocking design (for easy removal of the bottom piece, like the Bamboo case) and it comes in a range of eight colors. It also sports a soft-touch finish that gives users a slip-resistant grip without being too sticky or “grippy.” So if you’re worried about pulling your iPhone out of the pocket and dusting off the fuzzies (so a friend can oogle over it), don’t fear. This is actually designed to resist lint. To sign up for an alert when the product becomes available, click the link above.

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Have you got a case that you can’t live without, or know of one not listed here? Let us know in the comments below. We’re always on the look out for more items, and if we get them in the house, we’ll give you full scoop on them.