I whipped up my first Fitbit watch face yesterday based on an old Casio watch. It's not finished yet as I want to use the proper old style digits for the time. :
Goodbye Pebble - Hello FitBit - Alan Pope's blog
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Polyester Small Watch Strap for Fitbit Charge 4 Midnight FB168WBNVBKS - Best Buy
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For Fitbit 3/2/1 Lite/ Sense Soft Cotton Loop Watch Band Fabric Elastic Strap | eBay
Amazon.com: amBand Compatible for Fitbit Versa 4/ Fitbit Versa 3/ Fitbit Versa 2/ Fitbit Versa Lite/ Fitbit Sense 2/ Fitbit Sense Bands with Case, Protective Case Strap Rugged Sport Protector Wristbands Men