I've run into this problem numerous times with my writing. I love my stories and I want to finish them, but I keep putting it off to do other things.
What you can do is sit back, relax, maybe listen to some music, and plan out what you want to write or draw in your head. Imagine the characters and what they're doing and thinking. Just let your mind run wild until you get the urge to work on your project.
If that doesn't work, lock yourself in a quiet room with your computer or notebook and just write/draw whatever comes to mind. It doesn't have to look pretty or even make sense. Just go crazy and have fun with it.
Also, it helps to know why you're putting it off. Most find themselves putting it off because they're scared. Some are afraid of failing or people bashing their work while others don't want to finish it becomes it means change. Like when I wrote fanfics as a kid I just wrote them for fun and even though they sucked I was writing like a madman. But when I started taking it seriously I kept hitting writer's block and a serious case of laziness. So ask yourself, "If I love it so much, why do I keep putting it off? What am I afraid of?" If you find out the reason it will be easier for you to cure it.