If you want to change the colors of your Joy-Cons that came with your Nintendo Switch, there are a lot of great third-party options you can pick up.
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Nintendo Switch Joy-Con Controller Pair Neon Green & Pink - JB Hi-Fi
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Nintendo Switch Custom Joy Con Controller Joy-Cons NEW! PICK YOUR COLOR!, joy cons
How to customize the look of your Nintendo Switch Joy-Con controllers - The Verge
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Nintendo Switch Joy-Con Controller Twin Pack, Wireless, Rechargeable – Neon Pink/Neon Green
Nintendo Switch Mix & Match Joy-con Skins Aesthetic Joycon Wireless Controller Decal Pale Green, Light Mint, Deep Green, Bright Teal - Canada
Here's where to pre-order the new pastel Joy-Con controllers for your Nintendo Switch
You can build-your-own Switch with custom Joy-Con in Japan - 9to5Toys
Joy-Con Colors - Nintendo Switch Guide - IGN
The Nintendo Switch's Joy-Con drift problem, explained - The Verge
Is this switch with inverted joycon colors legit? - The Independent Video Game Community
Nintendo Switch Owner Collects Every Single Joy-Con Released Worldwide – NintendoSoup