As a freelance designer, consider these passive income ideas:

1. **Digital Products:** Create and sell design templates, fonts, or graphics online.

2. **Print on Demand:** Partner with platforms to sell custom-designed merchandise without handling inventory.

3. **Stock Photography/Illustrations:** Upload high-quality images to stock sites for royalties.

4. **Online Courses or Ebooks:** Share your design expertise through educational content.

5. **Affiliate Marketing:** Promote products or services related to design and earn a commission on sales.

6. **Subscription Services:** Offer a premium design resource subscription for a regular income.

Combine these strategies to diversify your passive income streams.