The paper is the card stock supplied by Strathmore for their 5x6 7/8" blank cards. There is no weight listed on the box but I would guess it to be about 80 pounds as I did have a problem with the paper curling even though I had it taped down. After the project was completed I wet the backside and weighted it down under heavy books, but still could not remove all of the twist. :( I was attracted to the dark green deckle edge on the bottom edge of these cards. (I've cropped that out of this image, by the way.)
I made the veins on the lavender petals, leaves, etc, with a manicure tool, drawing in the lines while the petal was still damp.