For myself I get a little burned out playing the same songs over and over. What keeps if fresh for me is learning something new, especially if it's a little challenging at first. So here's my formula; come up with something new, sit down record it, listen to the parts that need work and play it again and again until it's perfect. Then do a final finished recording, maybe upload it to my Soundcloud (so I can share it), and BAM, something new to keep it fresh and fun. What do you guy's do??