I doubt that any font actually has the right glyph for this yet, but apparently, Unicode (6.0) includes the "💩" character (0x1F4A9), which is described thusly:
1F4A9 PILE OF POO = dog dirt
There's several more rather quaint ones in the same area, too. How about "1F3E4 EUROPEAN POST OFFICE" (🏤)? Or "1F46F WOMAN WITH BUNNY EARS" (👯)? Or "1F4D4 NOTEBOOK WITH DECORATIVE COVER" (📔, which is apparently distinct from the plain "1F4D3 NOTEBOOK", 📓)?
There's even a "1F43A WOLF FACE" (🐺). Yay. ^^
(All these are part of the "emoji" symbols that recently got added and that are apparently quite popular in Japan and elsewhere in eastern Asia. Unicode is trying to help with standardizing these, which is a good thing, but I personally still find them quite amusing.)