Yeah, I'm not a lead guitarist, so I spend most of my time comming up with riffs. I do kindof like singers do. I record (or make mental notes) riffs and then eventually when I'm writting a song, I might use one riff for the intro, one for the verse, etc... It also helps to have a bunch of riffs when you join a band. I've been with my band for probalby a month now, and when we write songs, they'll normally start out with me playing some riff I've come up with, and we go from there.