Mice make trouble / Becky Bloom (2000): When Henry uses his sister’s magic colored pencils to draw six mice and a hedgehog, they all come to life and make a heap of trouble.

The good-luck pencil / Diane Stanley (1986): A magic pencil which Mary Ann discovers accidentally brings her more good luck than she can handle.

The long, green pencil / Sara Werner (1990): Lizzie uses a magic pencil to rewrite the lives of her parents but finds that she misses the way they were.

There’s also an older children’s novel called “Marianne Dreams” by Catherine Storr, about a little girl who’s sick in bed and draws things that come to life. There’s something in it about menacing rocks…

You can also post your description at these websites for more exposure to your question:

http://forums.abebooks.com/abesleuthcom

http://www.loganberrybooks.com/stump.html

http://www.whatsthatbook.com

http://www.auntbook.com

Good luck!