Favourite trick on stage when I know that I have to fire up a burning solo is mixing fingerpicking and pick-picking to throw out some countrystyle licks.
Practicing tricks that work for me are playing "live" with for e.g. Jimi Hendrix, SRV or Joe Bonamassa on DVD. You have to get into the mood, make sure you got a nice sound, position yourself on front of the TV (with your guitar of course), make sure you got something to drink (beer works well) and some snacks for the breaks...I sometimes play entire gigs...it's like sessioning with the guys and you learn a lot! Keep that as a special, maybe once a quarter year.
Another trick that works for me is following the chords with arpeggios, I implement arps more and more in my playing and I find that they offer the opportunitiy to play very melodically. I love implementing the diminished arps in my play, man they give your solos a nice colour!
the most common trick I use is work with a practicing schedule and make sure you have a practicing log!
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