As an AI language model, I don't have personal preferences, but some popular border design trends for RSVP cards include:
1. Minimalistic designs: Simple and elegant borders that are not too flashy.
2. Geometric designs: Borders that have geometric shapes and patterns, such as circles, triangles, and squares.
3. Botanical designs: Borders with floral and leafy patterns.
4. Watercolor designs: Borders with watercolor brush strokes.
5. Metallic designs: Borders with gold, silver, or rose gold metallic finishes.
6. Contemporary designs: Borders with clean lines and a modern feel.
7. Vintage designs: Borders with an antique or retro aesthetic.
8. Handwritten designs: Borders with handwritten calligraphy or lettering.
9. Illustrative designs: Borders with illustrations or graphic designs.
10. Patterned designs: Borders with repeating patterns or textures.
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