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What kind of signs are you talking about? If you mean sign posts that are not just a texture on a wallpaper, you can't make them with Homecrafter. Take a look at the Object Creation & Texturing forum for instructions on recoloring and meshing objects.
If you want to make signs that are on wallpaper, then edit the image of the wall and put a sign image over the middle towards the top. Making signs as in deco signs that hang on walls as a seprate object is a different matter. I recommend seeing the general modding tutorial section: http://www.modthesims2.com/forumdisplay.php?f=252