I love botanical prints, and have many old ones over the house. However, I had a space for some artwork and some box frames lying about, so decided to make my own modern version of botanical prints. They looked great, and I sell mine a lot, they can even be customised for clients with text:
Using royalty free images found on-line, I pick one image and then print it up either on aged paper or pages from old books, in varying scales of size, about 5 copies per image. It needs to be strongly coloured to work well. Then I cut them out carefully with a scalpel. Mounting them is trial and error, starting with the biggest at the rear and then building them up. Pinching and curling some leaves etc added to the 3D effect. Using small pieces of sponge cut to size and a glue gun, you attach each layer so it protrudes.
You can also print straight onto old pages if you do not want to do a 3D effect. I used old encyclopedia pages, and printed the botanicals straight on top of them:
I have now started on birds and trees: