Hi Helen,

I've used rice paper with some of my framed pressed flower art pieces, using Matte Modge Podge (not the glossy type) as an adhesive.

I would recommend applying a light coat of Modge Podge over your flowers (assuming they have already been glued to your card), and then place the rice paper on top, carefully smoothing out any air bubbles or wrinkles. Apply another coat of Modge Podge, and let dry. If need be, apply a second coat.

I hope that helps!

Kind Regards,
Elizabeth

Here is a link that might be useful: Elizabeth's Flowers