If you are not stuck on the sword styling or otherwise more typical celtic styled silver/chrome/pewter classical types, I would suggest hitting ebay and doing a search for "miracle pin", "miracle brooch", or similar. Miracle has a long history of making inexpensive jewelry pins of various semiprecious or non-precious decorative stones in a wide variety of styles that should stimulate some different ideas. I almost never wear a classical sword style pin anymore, or even a pin that was specifically designed for use as a "kilt pin". Decent costume jewelry works and looks great, won't break the budget, and brings you own unique flair to the decorative function of the pin. Alternatively you could go old school with the simple blanket pin (same pin schoolgirls used in their plaid dresses) which are available in 3 and 4 inch sizes in various finishes on Amazon for relatively cheap in small bulk packages.