1) Slow down - most people tend to try to play as fast as possible (myself included :o ) and as a result their playing can become pretty samey as they're concentrating on speed through scale shapes rather than the sound they are making.
2) Try a different scale - maybe instead os natural minor, try Phrygian... or instead of major, try Lydian... it might sound 'wrong' but once your ears get used to it you might find something interesting.
3) Keep going - you need to just play to become more familiar with the sounds you're making. Once you become more familiar, you'll play less mechanically, and more by feel...
Just a few thoughts. It'll come with time... :)
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