Quick Instructions
click the skin sample you like
save the .zip file to a place you can easily get to
unzip (using the default unzipping in windows ME & XP or a program like winzip)
Copy & paste the new folder to this location
C:\Program Files\Yahoo!\Messenger\skins\

Newer ones are .exe files. Download to anywhere you'll remember. Then run/open it & follow steps.

To use the skins
Open yahoo messenger > click file > preferences > appearance
then choose the skin to use from drop down menu > click apply
all skins by me now have _BAS at end of name.

*Note*
I only use graphics I have permission to use in this manner