ReplicateModifiers and Seeds
Examples can be found at
http://cs.sru.edu/~ddailey/svg/randC7.svg
http://cs.sru.edu/~ddailey/svg/randD4.svg (currently Opera only: needs to be reworked for Firefox)
http://cs.sru.edu/~ddailey/svg/randomD12.svg  (Opera, Safari, IE  )
http://cs.sru.edu/~ddailey/svg/randomE0.svg
http://cs.sru.edu/~ddailey/svg/randomE2.svg  (Opera only)
http://cs.sru.edu/~ddailey/svg/seeds.svg
http://cs.sru.edu/~ddailey/svg/Turbrep2.svg