I am a little late on the gates on this one but I figured that this would be a great project for me to do this summer. You can find more information over on Daisy Yellow's blog.
Number 1 I used a Bic 4color pen in brights and just doodled flowers.
Number 2 I used 3 different colors of Prismacolor Markers and a black ballpoint pen.
Number 3 I only used a chisel tip Sharpie Marker.
Number 4 I used a Faber-Castell Pitt artist pen big brush and a black ball point pen.