Mapping Center Answer:

If you can find any teardrop graphic symbol that you want to use (e.g., on the internet or in some clip art), you can use it in ArcMap.  You simply have to save it to .emf or .bmp format and then reference that graphic image file when you edit the symbol as a picture marker symbol. Here are the steps...

...once you find a teardrop symbol you like, save it to a location on your computer that you will remember -- and be sure to save it as a .bmp or .emf file.  Then in the Symbol Property Editor for the symbol, change the Type to Picture Marker Symbol and then navigate to the location of the graphic image file. This will reference the graphic image file to create the marker symbol.

Note that once you reference the image to create the picture marker symbol, you do not have to save it anymore.  Note also that you can save the symbol you edited to your personal style if you want to use it again (click Save as.. from the Symbol Selector dialog.)