Problems Occurred in set image in Rubik cube Game

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Java

Mobile

OpenGL

Android

Hello friends i am new in Game development and work on Rubik Cube Game In Android using OpenGL.

Problem is that i want to set cube color with black border but unable to perform this task

GLColor[] colors = new GLColor[6];

// Paint front green
i=dim-1;
for(j=0; j<dim;> for(k=0; k<dim;> cubes[i][j][k].setFaceColor(Cube.kFront, colors[faceColors[Cube.kFront][j][k]]);
}
}
In this code front paint total Green but i want to paint green with black border. so how can i include black border around it in OpenGL?

please help me i am unable to attach screen shot due to not enough reputation