Yes, there are several tools and software options available for creating custom illustrations. Whether you’re a beginner or an experienced illustrator, you can find a tool that suits your needs. Here are some popular ones:

1. **Adobe Illustrator:** This is one of the most powerful and widely used vector illustration software. It’s suitable for professional illustrators and designers.

2. **Inkscape:** It’s a free, open-source vector graphics editor that is a great alternative to Adobe Illustrator. It’s suitable for both beginners and advanced users.

3. **CorelDRAW:** This is a vector graphics software known for its versatility and is used for various design tasks, including illustration.

4. **Affinity Designer:** A more affordable alternative to Adobe Illustrator, it’s popular among designers and illustrators for its vector and raster capabilities.

5. **Procreate:** While primarily used for digital painting and illustration, Procreate is a favorite among illustrators on the iPad.

6. **Gravit Designer:** This is a free design software that’s good for both vector graphics and illustration work.

7. **Figma:** While known for its collaborative design features, Figma can also be used for creating vector illustrations and icons.

8. **Sketch:** Although more focused on interface design, Sketch can also be used for creating custom illustrations.

9. **GIMP:** This free, open-source raster graphics editor is often used for image editing, but it can also be used for digital painting and simple illustration work.

10. **Krita:** It’s another free and open-source painting program that’s suitable for both concept art and illustration.

The choice of tool depends on your specific needs, your level of experience, and your budget. For vector-based illustration work, Adobe Illustrator and Inkscape are excellent choices. If you’re looking for a more natural and painterly approach, tools like Procreate, Krita, or even Adobe Fresco may be more suitable. Consider trying out a few of these tools to find the one that works best for your illustration style and workflow.