Here's a screenshot of a simpler way than posted earlier. The screenshot is hard to read, so here's a step by step instruction list. 1: Load your texture 2: Go into the material room and disconnect the texture from the Diffuse setting. 3: Create a new node off the diffuse setting for Color_Math (not off of the alternate diffuse setting). Make sure the color for both value 1 and value 2 of the Color_Math are set to white 4: Attach Value1 to the texture 5: Create a new 2D texture node off of Value2 (image_map) 6: Load your tattoo into this. Set the image mapped parameter for this to None (default is tiled). Size your tattoo using the U_Scale and V_Scale parameters. Position it using the U_Offset and V_Offset parameters. Set the strength of the texture too. Real tats aren't solid after the first day, they all fade a little. I usually use .7. You're done.