A skirt guard [in this case crochet] was necessary for ladies who cycled in long skirts. The guard prevented the skirt flapping into the spokes and causing an accident and preventing mud from splashing up. Modern cycles don't even have a mud guard.
Idea: dye the doilies to match the wedding colors (mint, coral, ivory and gold), see them together artfully so the colors combine in a visually appealing way and use as a table runner. The tables should be gently distressed gold