Some good string art design patterns include a pattern for a candle and one for the word "dream" in a variety of colors. As of 2015, both of these patterns are available for free at GuidePatterns.com.
The pattern for a candle includes a flame and base for the candle. This pattern blends together two different colors with a yellow on the top and bottom and red for the candle. To get to the pattern, click on the photo of the candle to receive a PDF version of the pattern and detailed instructions.
To make the string art with the word "dream," use at least five colors. Access this pattern by clicking the picture, and the instructions include information such as nail placement.