: A great source for over 23,000 free number graphics and illustrations that require no attribution.
If you're looking for a "Free Image Site" specifically for (lucky or aesthetically pleasing numbers), there isn't one single official repository under that exact name. However, you can find high-quality, royalty-free images of numbers, lottery balls, and "lucky" symbols through several popular stock platforms:
: Offers a wide range of "lucky number" vectors, stock photos, and PSD files that are free for commercial use.
: Provides thousands of high-quality number photos with no copyright restrictions.