Have you seen the beautiful new V&A papercraft collection from Trimcraft? As well as the lovely papers and usual embellishments there are fab little washi tape stickers in the shape of petals and leaves :)
The stamp and die sets are gorgeous too. I've used the flower stamp here on patterned paper but I'll show you another one (maybe tomorrow) where I've used the leaf dies to make a butterfly
I love the how they can look like pressed flowers when you assemble them on a card.