My favorite way is to just have this in my zsh aliases.

  # Find file by prefix (ignore case). 
  # Usage: 'f' or 'f myfile' or 'f myfile.txt \etc' 
  # or f '*css'

  function f() {
    find ${2:-.} -iname "${1}*" 2>/dev/null | grep '^\|[^/]*$'
  }

  # We use noglob, so zsh doesn't expand characters like "*" 
  # and so we can do e.g. f *css
  alias f='noglob f'