(Pocket-lint) - Have you got tired of noticing little circular grips on people's phones without knowing what on earth they are?

They're called PopSockets, if you need an answer, and they've become pretty much ubiquitous these days, whether you're in the US or the UK. It's a big business, too - the maker of PopSockets was the second-fastest growing US company in 2018, according to Inc, and has sold well over 100 million of those cheap, door knob-shaped gadgets.

It's a simple enough idea: the original PopSocket sticks flat to your phone, and then it can be popped out whenever you need it. They are best used as a grip for when you want to take the perfect selfie, or as a stand for when you want to read or watch something, hands-free. Part of the appeal, too, is the endless custom choices they offer, and that range has grown even more over time, thanks to additions like the Swappable PopSocket, which allows to keep the same mount and yet instantly change the top designs based on your mood or outfit. PopSockets also makes a range of cases and accessories, though we're sticking to their original product for now. 

We've compiled a list of the coolest patterns and designs currently available. Of course, if nothing on our list catches your eye, then check out the create your own section of the PopSocket site to make your own stellar look.

Best PopSocket designs

PopSocket

Ghost Marble

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The ghost marble design is a non-swappable design and would look great with a black case.

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Opal

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A pretty-looking opal PopSocket that can be used to accent your jewelry nicely, with an iridescent feeling to it.

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All Black

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Here's a classic, all-black, non-swappable design.

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Peace Mandala

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This Peace Mandala PopSocket is a great swappable choice for the hippies and yoga enthusiast in our lives.

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Death Star

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Ever wish you had the power to destroy Alderaan in you hand? Here ya go. This is an original pop grip that's not swappable.

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Vinyl Record

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This record design is swappable and ideal for the music lovers out there.

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Blue Nebula

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The Blue Nebula design is for people who'd rather look up at the stars than down at their phones. It is also swappable.

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Mermaid Scales

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A great swappable choice for big fans of The Little Mermaid and avid fishers alike.

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Sparkle Party

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Who doesn't love a good sparkle party? This design features the swappable pop top, too.

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Blush

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This one is glittery and pink. It's also got the swappable pop top. What's not to love?

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Basketball

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A basketball for the hoop lovers. PopSocket also offers football and baseball PopSockets. They're swappable, too, so you can switch them for whatever season you're in at the moment.

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Saffiano Rose Gold

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This PopSocket is made from premium vegan leather. It has a swappable pop top. If you love the vegan leather, then be sure to check out the other colours.

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Replicator

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This is a cool, trippy design that resembles some of the marble patterns. It's also available in the swappable pop top.

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Palm Trees

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Nothing like some palm trees to help you through winter, and its swappable, so it can be changed whenever you want.

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Holographic

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This PopSocket has a nice tie-dye like design that features the swappable pop top.

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Golden Silence

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This beautiful mandala looks great set against a black phone case and features the swappable pop top.

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Wave

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This cool design is great for surfers and beach lovers. It's an original pop top, so no swapping with this one.

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Space Grey Aluminium

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This design is part of PopSocket's metallic lineup of pop tops. It's also swappable.

Writing by Maggie Tillman. Editing by Max Freeman-Mills.