if u are trying to come up with a chord progression but keep playing on that has already been written (as i do) there is a quick and simple solution. simply try moving one chord up or down 1 fret. for example the change from Cmaj to Gmaj has been done a thousand times and is a bit boring to build a song around. however try changing to a F#maj instead for a brill sound. using this i have found loads of brill changes which sound out of this world. examples are Bmin - Fmaj and A#maj - Dmin. simple things like this can realy spice up a chord progression and even allow you to change keys easyly. adding a key change in the middle of a solo is a great way to add intrest to an otherwise boring song