The point of it would be that if the link went 404/403/500/whatever, then the 'filter would use the alternate URL (if one was specified) rather than removing the link. If that goes too, then the link gets deleted, but there'd be a bit of a fallback for our links..
It's not something that would always be used or useful, but I believe it would get enough use to warrant it's inclusion.
Except there's a typo.. it's supposed to read "deathburger day". ;)
All the regular skins are there, plus an option for "Custom". This custom skin would be based off of one of the other skins. The user would choose which skin to base it off of.
After that, some forms to let you change the images to something of your own choosing. If the replacement image isn't of the same size as the original, then it would be scaled to fit the original dimensions.
As an example, with this ability I could customize based off of Robot Dreams, and use this image in place of the default top logo.
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Idea:linkfilter.net - The unofficial feature request journal
Obviously this would only apply to individual polls, journals, or links.. none of the index type pages. They'd display the original title.