I would always plan out a solo, or as Dewy said, play parts that make the song/solo identifiable.
BUT when it actually came time to do it, more times than not, all that 'I'm going to do a diminished scale here, then the pattern there' sort of thing went out the window and I'd just step on the fuzz, the wah, take my hands off the strings, grab the vibrato bar and let the guitar feedback for the whole solo.
It's like that one momet, that one instant right before the solo, all these other ideas would come up and it would just be feedback or long sustained notes or crazy atonal patterns.
Then drop right back into the song.
Not all the time, but some times - like the 'mood', the 'Rrrraaaahhhhrrrg' feeling would hit and that was it for all the carefully planned out stuff
