This presentation describes aqueous gel based devices with new functionalities; diodes/memory devices, solar cells and microfluidic reactors. Such devices are inspired by materials, structures and processes in nature. The advantages, such as softness, biocompatibility and high ionic conductivity, could enable hydrogels to be novel materials for biomimetic devices operated by ionic current. Moreover, microfluidic patterns are easily formed in moldable hydrogels, where unique convective/diffusive transport mechanism in porous gel could be used for uniform delivery of reagent solution.