Great if we could change our own icons.

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First swing attached. This adds a "Custom" option to the icon style dropdown, that exposes a CSS file path field when it's chosen. Screenshot attached to demonstrate.

Minor tweak from #2: added the new variable to those deleted on uninstall.

After reviewing this patch, I found a bunch of stuff I wasn't crazy about in the 1.x branch that this relies on. I've pushed a new branch that diverges from the 6.x branch, implementing some of the d7 APIs. It's a pretty extensive change, but will make this work pretty trivial, I believe, as there are now bona fide icon styles that can declare icon paths. A theme can implement hook_follow_icon_styles_alter to alter an icon path for any of these styles, or declare it's own style. All that is necessary is that the icon paths match up.

I'm going to mark this as 'needs more info' as I'm not sure if this suffices for your use case or not. In theory, if we wanted to make this easier for themers, we could allow a setting in the theme's info to specify the icon path, but I worry this might be overkill. Alternately, we could create an admin page that you could go to to specify the icon path. This would allow us to throw up warnings if there are missing icons, but I'm less crazy about the idea of this as it would mean more variables to save. Anyone can add their own follow.css to their theme and override the icon urls themselves there as well.

I encourage you to check out the 7.x-2.x branch (when it becomes available, currently waiting on d.o to create the file) to see what you think.

This is pretty close.

The one complaint I have is that themes cannot define new icon styles. The theme can implement hook_follow_icon_styles(), and you can add a new style to the $styles array…but that new style won't be available when configuring the block, so it can't be chosen. Since the admin theme is the active one when configuring the block, hook_follow_icon_styles() is invoked on the admin theme and not your site theme. You can override one of the existing styles, but not define new ones.

Note that the hook_follow_icon_styles function in follow.api.php should have an _alter on the end of it.