Mask both roses off the background and use image/adjustement rotation tool to rotate them to make new petals for the new flowers. For the blue flower, combine both layers. Merge petal layers (for each flower) after done.

Use image/adjustment hue/saturation and colour balance tools to create new appealing colours for some of the flowers.

Use new CS 3D tool (New shape from layer/Sphere) to create a 3D-sphere from each of your flower layers.

Use 3D rotation tools to rotate sphere to show en aesthetic side of your strange creation.

Rasterize your 3D layers (use rasterize layer with your right mouse button over the layer) and make duplicates. Add them on top of each others and try different blend modes to acquire the ethereal double-petal -look.

Plan your composition and start the bothersome masking process to hide the shadow sphere around your ethereal flowers. (Magic wand+traditional brush does the trick quite easily really..).

I left some of the spheres shadow to act like an extra featherly petal for 2 flowers.

After a few minutes (or an hour)of masking it starts to look like something like this. Your flower balls can breath some fresh air now and looks a bit less heavy. (Thou the flower ball looked kind of cool too.. don't u think?)

The vase is pretty neutral now, so I went for the lazy mans colour me with a layer -trick.

Duplicate your blue 8 petal flower and shape it to cover your vase. Overlay-mode with about 93% opacity seemed to work for me. Adjust the individual colours with traditional tools if you wish.

Take your leaf source (wouldn't be a huge work to make from the source too, but well.. I am/was/will always be lazy.).

Use warp tool to modify each feather, use horizontal flip when needed and try to make them fit your composition and stems. (Well, you need to duplicate and warp some of them too to give each flower a stem).

Use hue/saturation and level tools to add a bit different shades of green on your leaves.

Make that messy water colour painting like look (without an easy filter) by using a clone pattern (After you have saved all your layers and merged them, of course..) with a very light opacity setting (like 20-30%). Take the source for your clone stamp tool from the edge of each flower and leave and draw with quite a big pencil size several times over the edge, every time from a bit different distance from the edge. You can make opaque colours similar to water colour bleeding. Brush several times from the same distance to add darker tone.

This part will take a lot of time, you should do the same for the vase too.

You don't need to be very exact, if you keep the original image size pretty big.

Duplicate your finished layer, add a strong gaussian blur (anything from 4-10 pixels) and use some neat blend more like darken or similar with a light opacity to darken and soften the colours even more.

Finish all the bad spots with some hand work and here you have your 3D flowers made to 2D watercolour painting.