Open a flower tube, either one you made yourself, or one which is OK to use for your own projects, then apply the Mapped Thingies filter in Filter Factory Gallery F. I like to reduce the default setting on the Stripes to around 10, depending on the image.
Make a copy of the flower and recolour it to your liking. Then Select – Select all – Float – Defloat, then Select – Modify – Select selection borders and modify by 3-5 pixels on both sides, depending on the size of your flower and the size of the border you want. Add a new raster layer, and then fill with a gradient, a complementary colour, a pattern, or fill with white and apply a Super Blade Pro Preset. Select none.
Add a new layer between the flower and the edge pattern, With your Freehand selection tool draw around the petals (I like the Smart edge option), then fill with the same pattern or apply the same effect as on the edges.
You can also play with the flower layer, adding some texture or other effect.