I definitely don't plan on having all of these done, but these are my possible ideas as of lately.

• Brown acorn
• Anchor
• Horseshoe
  • Ends facing up, of course
• ॐ (Om)
• Lotus
• ॐ मणि पद्मे हूँ (Om Mani Padme Hum)
  • In Tibetan or Ranjana
• Virgo symbol
• Calaveras design
  • Plus all Mexican folk art
  • Any milagro-inspired design, too
• Roman numerals of an important date
  • ie. Marriage
  • birth date of child
  • etc.
• Mandala design of some significance
• Personal monogram
  • I plan on keeping my maiden name
• Fabergé Egg
  • Maybe incorporated in monogram design