Use a Major Pentatonic with an added blues note borrowed from the relative minor blues scale for a nice country sound.
EX: G= G A Bb B D E
A lot of country players incorporate a lot of chromatics into their playing. Try taking a two note motif and walking it down chromatically until it resolves into the chord.
EX (to be played over G maj); D F, Db E, C Eb, B D.
A lot of Rockabilly players will incorporate BeBop licks into their solo's, this may be something you want to check out.
Reccomended listening; Check out Duke Levin, great player, primarly country but incorporates a lot of different styles into his playing.
Where's Skee when you need him?