Creating vector shape from a raster graphic image:
Step 01
Open image in Adobe Fireworks,
Select magic wand tool from tools, click the cloud (or any object and convert it into path).
Incase you want to select more than one object, keep the shift key pressed & selct the objects with the magic wand.

Step 02
Go to the Select menu, convert marque to path.

Step 03
Vector shape (path) is now ready.

Step 04
You can change the colors from the properties (as shown in screenshot)
