i play slide!!!, well just started really but its opened a whole new area of playing for me, was stuck in a rut myself. i saw ben harper in concert an he plays amazing slide guitar, but plays it across his lap. any way, try an alternative tuning. mine now is set to E B E E B E. an i found that quite a few licks an riffs could be made out of that very easily. other than listenin to other artists and their styles (i would suggest ben harper. Amazing!) or try playin along to a simple chord based song, that you know well, and playing something different over it usin slide chords. this is where the above tuning comes in very handy as it is open tuning so you can slide the chords about.