Plenty, none really worth the bother though. Not going to gain any miracle increase in performance.
Cheapest method) Open the side panel of your computer
Cheap method 1) Transplant the entire computer to a larger chassis with better airflow
Cheap method 2) Buy some 120mm static pressure fans, remove the old fan and shroud, strap the new fans to the heatsink blowing down on the card.
AIO water cooling) Buy something like an NZXT Kraken G12 and a 120mm Asetek style AIO water cooler.
Custom) Get a universal GPU water block, and build a full custom cooling loop with pump/reservoir, radiator, and tubing