All of these brushes are taken from my own photographs. The result is really lovely, and you can use them with anything. I just did some random brushing of the different flower brushes you can use over some rendered clouds to give you a basic idea of what they look like before you download.
NOTE: When you download, a favorite would be appreciated. If you don't like the brushes however, feel free NOT to favorite if you download. It's up to you really. If you use them, I'd like to see how you went about throwing 'em into your own creation, but again, not neccessary.
(These are only compatible with CS2 for now. I should be getting a version for you Photoshop 7 users soon.)