A Happy Birthday message, plus a great trick- all in one!
First produce the black and white silk with the Happy Birthday message on it. Let your audience get involved in making the message even "more special". Put the black and white silk into your change bag or other switching prop, let them pretend to toss a bunch of color your way, and pull out the silk again- it's now in full color!
Of course, you can always just produce the color version as a grand finale to your birthday party show!
Set of TWO high quality 100% silk scarves. One shows the birthday picture in outline form, like a coloring book page, and the other silk shows the same picture, but in full color.