Photoshop 6 Folks - does the following hold true for PS6?
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Hi Sonya:
I'm a Photoshop 5.5 person, but I suspect PS6, 7 have an installation file structure similar to 5.5.
With 5.5 came a folder called "goodies," (and a folder within goodies, \Goodies\Adobe Photoshop Only, where in addition to brushes which it sounds like you found, I also I found more Adobe-developed actions, gradients, textures, color swatches, etc., too.
I'd poke around more that folder if you haven't yet. Some of the file sufixes are:
* .atn - Action
* .abr - Adobe Brush (I guess)
* .psd - Textures (maybe some .jpg)
* .gdr - Gradients
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Have you discovered all the free brushes, gradient, actions, textures, etc. that can be downloaded free from the net?
I use google.com a lot for this kind of thing. If you tried a search argument such as:
photoshop custom brushes
...and I'll bet you'll be in brush heaven (or heck) for about three years.
[I just reread this... I hope this is the kind of response / info you're looking for. If not, it was fun writing it!

]
~DannyR~