I think the black and white to color should be the exact opposite color to black and white. I find most people associate more with color than black and white. I do, however, wish people to take a look at the image in B&W.
I had created a code snippet with another skin but have not found the skin anymore. I am also trying to get away from custom code so that I can focus more on image preparation.
Is it possible to add "Color to B&W" as an option to the "Mouseover Effect" drop-down menu?
I'd vote for that, too. A page of B&W thumbnails is fine if you're presenting an album of B&W images, but for color photos, I'd rather have a page of color thumbnails that go grayscale when you mouseover them. In fact, most of my skins offer that option, rather than the other way around.
I don't see the point why moving the mouse over a thumbnail that turns black and white would be intriguing. Those who like the thumbs in color, I believe should pick another mouse over effect, e.g. zoom.
Centering is another matter entirely. The Tiger lightbox caption simply isn't centered, and our new buttons are part of the caption. Skin-added buttons are on the right, and user-entered caption material is on the left. The CSS is sufficiently tangled so that forcing it to center is tricky, if it's possible at all.