I liked the natural colours and wanted to preserve them, so I coated them on both sides with Artisan ‘Flat Matte Sealer’ which is a water-based, clear coat. You can use any water-based clear varnish for this purpose. It gives the leaves a nice, clean, sealed surface to adhere to, and also protects them from drying out and breaking.
Of course, I just had to use the ‘Gumnuts and Grevilleas’ transfer (Australian Wildflowers III) from the Aussie Decor Transfers range. I used the black transfer tool to rub them onto the surface, once the sealer had completely dried.