I downloaded a skin but I don't know where to put it for limewire to register it.
I think I'm supposed to put it in "themes" but thats a .jar file not a folder and there doesn't seem to be any other way to make limewire see it.
Anyone got any ideas?

Put it in the "themes" subfolder of the ".limewire" folder in your user home directory.
The jar is just used for the default distribution, but themes are updated and used in LimeWire from your home directory.
Then use "View/Apply theme/Refresh list" to see it listed in the themes menu, where you can select it.
If you download a theme from Gnutella (or from a magnet link on the LimeWire site), Limewire will download the file and will recognize it as a theme file, and will then propose you to install the theme.

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I know what i'm supposed to do.
The problem is that doesn't work.
I'm using Classic (OS9) and using V4.
The only folders in the limewire folder are "root" and "UninstallerData". Everything else is either ".jar" files or other files with the exception of Limewire itself.
I've resorted in just placing the skin in the Limewire folder which doesn't make any difference.

Put it in System Folder/Preferences/.limewire/themes.

If that doesn't work, make a copy of the lwtp file, substitute .zip for lwtp in the filename, drag it onto stuffit, then also add the new folder to the the themes folder. Looks like the Macs aren't reading the stuffed file properly.

Philippe will probably figure out what is going on and submit a patch to LW.

It's true that on Mac OS 9 there's no per-user home directory. Instead the global "Preferences" folder is used to create the ".limewire" folder where LimeWire will store your user's settings, your themes, your shared file caches, your local connection hosts file cache, and the state of your incomplete downloads.

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There's nothing wrong with the way Limewire handles .lwtp files downloaded from Gnutella. But if you download it from the web, you need just to save that downloaded file in your user's Preferences, and click on "View/Appy Theme/Refresh list" to process the new file.
Beware that some web browsers may attach some additional resources to the downloaded file (an icon or application association). LimeWire will ignore the supplementary resources for that file, because it will just process the data fork of that file. However, .LWTP files are in fact zipped files, and if you have some tools that recognize it as a ZIP file (despite of its extension), this tool may alter the content of the ZIP archive to add some files in the zipped archive, or may want to reencode its internal "directory". LimeWire does not name the file with .zip by default on purpose, because there's no guarantee that such external tool will not alter its content in a way that LimeWire will no longer be able to process (for example some unsupported Mac-specific ZIP file extensions stored incorerctly in the data fork instead of the resource fork which LimeWire ignores).

One note: I can just figure out what's happening on Macs according to what is written in the source code. But I have no Mac to test what's happening. Ask to rkapsi instead (if we wants to help) or to a Limewire team member (Sam, Greg and Adam often visit these forums to read comments from users, and sometime take the time to reply; however assurance to get a reply from them will not only made for those that have LimeWire Pro and send their request by email to the support LimeWire address; for LimeWire Basic users, they need to find clues contributed by users visiting these forums and share their experience and ideas).

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Thx for the help. Found the theme folder in pref's. I put it in where I found all the other themse shown in Limewire.

*Doh, should've thought of that!...*