Check out the high resolution colorful abstract background images which can be used for the thematic banners. You can download and use these background images which comes in six variant colors.
Additionally the PSD file can be used to tweak the colors and gradients of your choice.I have used the Floral photoshop brush for the foreground effect.
You can download the high resolution backgrounds ( 5000 x 2432) in the link below.
- Colorful androids logo iconset for download
- How to :create noisy gradient background in photoshop
- How to create panorama effect using photoshop