Tiling around an outlet can be tricky.  Below are two examples of typical cuts found around outlets.  

When using a mosaic tile sheet, cut out the area of full tiles around the outlet area. You can use those cut tiles in TileSizer™ so that you do not waste any tiles. Determine the size of the new partial tile around the outlet and mark the tile for cutting. TileSizer™ can hold more than one tile from the sheet at a time which will save you time and ensure you get a consistent cut.  When working with mosaic designs, make sure you remain consistent with the design when applying the tiles.  Attach the cut tiles to your surface.