The article discusses the potential of functional amyloids, particularly the bacterial proteins CsgA and FapC, as biomaterials. These proteins exhibit high stability, controllable formation, and easy availability, making them suitable for various applications such as hydrogels, bioplastics, and biosensors. CsgA has already shown promise in gastrointestinal colonization, regenerative tissue engineering, drug release, water purification, and biosensing. FapC, while less explored, shares many common features with CsgA and could be developed similarly. The article highlights the advantages of these proteins, including their ability to form stable fibrils under physiological conditions and their potential for redox-controlled assembly. It also discusses the challenges and future prospects of using functional amyloids, emphasizing the need for further structural understanding and engineering to enhance their catalytic and biomaterial properties. The authors envision that functional amyloids will play a significant role in addressing societal challenges, such as CO₂ fixation and plastic nanoparticle degradation.The article discusses the potential of functional amyloids, particularly the bacterial proteins CsgA and FapC, as biomaterials. These proteins exhibit high stability, controllable formation, and easy availability, making them suitable for various applications such as hydrogels, bioplastics, and biosensors. CsgA has already shown promise in gastrointestinal colonization, regenerative tissue engineering, drug release, water purification, and biosensing. FapC, while less explored, shares many common features with CsgA and could be developed similarly. The article highlights the advantages of these proteins, including their ability to form stable fibrils under physiological conditions and their potential for redox-controlled assembly. It also discusses the challenges and future prospects of using functional amyloids, emphasizing the need for further structural understanding and engineering to enhance their catalytic and biomaterial properties. The authors envision that functional amyloids will play a significant role in addressing societal challenges, such as CO₂ fixation and plastic nanoparticle degradation.