I haven't broken a pinky toe, but I broke the 4th toe on my left foot last July. The only thing that can be done is called "buddy tape". You take some medical tape (from your local drug store) and tear it in half and tape your pinky toe to the one next to it. Due to it's size, that's pretty much the only way to splint it. Then, make sure you elevate it, ice it down several times a day and take motrin (anti-inflammatory).
Sorry to say, but if you truly broke it, it will take several weeks to heal. Mine still bothers me every once in a while.