REVIEW - Fanatec Button Caps and Sticker Set - YouTube
Customising with Button Caps, Labels and Stickers - YouTube
Fanetec Stickers for Car Sim Racing Buttonbox/wheel Set of 4 2 Options 8mm or 10mm - Etsy
I recently purchased Fanatec's button cap/decal pack and I have to say, it's a very worthwhile, inexpensive, and idiot-proof bit of kit. The customization options are incredibly vast, with ~20,000 possible combinations
Fanatec Button Caps and Sticker Set - SimulatorCave
Button Caps and Sticker Set | Steering Wheel Accessories | Accessories | Fanatec