You might want to give PatternLock another try, but be creative. I chose a wall paper that would allow me to know where to start my pattern then I disabled the pattern dots, paths and arrows, and it will only vibrate if I get the pattern wrong.
I think this is very secure because it never even shows what kind of patterns are possible (3x4, 4x4, etc.) and I have it set to auto lock on device startup and when charging.