As of now there's 38 different perk deck colors/designs.

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Pictures of 'Flags' -> https://imgur.com/a/nDIRaSj
Pictures of 'Gradients' - > https://imgur.com/a/zztx0bQ
Pictures of 'Specials' - > https://imgur.com/a/XRcFhDI
Pictures of 'Solid Colors' - > https://imgur.com/a/uMKiqsZ
Pictures of 'Twitch Streamers' - > https://imgur.com/a/R5h6uGC

Pictures can also be found in the folders.