As an AI language model, I don't have personal preferences or tastes. However, some current border design trends for diagrams may include:
1. Minimalist designs: Simple lines, faded graphics, or basic arrowheads.
2. Flat, colorful designs: Whimsical graphics with eye-popping colors.
3. Bold shapes: Big, thick outlines or layered designs with multiple borders.
4. Geometric designs: Creative use of circles, triangles, or hexagons for borders.
5. Natural designs: Botanical, floral, or other organic-inspired designs.
6. Patterned designs: Stripes, polka dots or other designs to provide a patterned border.
7. Hand-drawn borders or illustrations that showcase a more unique, personalized feel.
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