If you want Larger fonts one approach would be to use the same tables and work from the pixel level. Just make every pixel multiple times the size. The characters do look boxy but easy to read. Here is a start from "C" code:

Code:
         FOR j = 0 to 4 step size 'Loop through character byte data
            FOR  k = 0 to 6*size  ' Loop through the vertical pixels
               IF pixelData[j] = 1  then  ' k=1 'Check if the pixel should be set  <== not correct in PBP
                  FOR  l = 0 to size  'The next two loops change the character's size
                    FOR m = 0 to size 
                        OLED_pixel  x + m, y+k * size + l   'Draws the pixel at x, y
                    Next m
                  Next l
               end if
            Next k
         Next J
I hope this gives you a start.