Some readers might like to know that there is a font available which has some emoji mapped into plane 15 of Unicode, which is one of the Private Use Area planes.
The mappings are from the following source.
http://www.unicode.org/~scherer/emoji4unicode/snapshot/utc.html
The font started as a learning experience of adding glyphs into a high plane.
At the time of writing this post there are only two emoji in the font, namely U+FE008 NIGHT WITH STARS and U+FE00D RAINBOW.
William Overington
2 January 2009