If you refuse to give up your OnePlus One for a OnePlus two you may still want to freshen up old faithful with a slick new rom. The all new AOSParadox Rom is probably the closest you will get to a full AOSP experience on the aging device. This rom is actually the first rom for the One that is not based on the CyanogenMod device tree and is instead based purely on AOSP. The rom also features a few additional optimizations for the Qualcomm chipset. Head to the link below for the rom download and full details.
via XDA