over the years [going back to the 1940's at least] pa titles have been various shades and color combinations.
earlier titles have been combinations of off white and cream with blue or green lettering, progressing through time with various shades of greens and blues, up to modern[ish] times such as the title for my "bus", which is a lightish blue/green in the center with black printing, surrounded by a 3/8" [or so] boarder that mimics the color and design of a dollar bill.
this is then bordered by a white outline that is offset to the right side, which allows a serial number to be printed in the lower left corner.

most titles of later years have a "thing" imprinted into the paper that will will pop out as "copy" [or something like that] in the center when photocopied.