There is something very appealing with double exposures, something which captures the very essence of analogue photography. It has to do with the experimentation, the unknown outcome, and the random element. Combining two exposures can be particularly rewarding once you add flowers to the mix.
When taking multiple exposures it can often be rewarding to combine something with a pattern, perhaps something colorful like flowers, as one of the exposures; this will serve as a backdrop or veil for the second exposure, which can be even more flowers, or something innocent like children.
One can also work with contrasts and try to balance the flowers with something that could be interpreted as their opposite.
But my favorite rule when it comes to doubles is that there are no rules. Do what ever you feel like; be curious and experiment, that is how you get something new and original. Maybe, try increasing the number of accidental double exposures by being a bit sloppy with keeping track on winding the film forward after each exposure? Maybe the picture looks the best as a negative instead of a positive? It’s up to you!