I started using Windowblinds at the beginning. I think the earliest I recall was version '0.3' ... it was definitely pre '1.0'. Some of us were finding tricks Neil didn't realize it could do...back when adding 'transport buttons' to operate Winamp was a 'thing'.
That was pre-Wincustomize ....some-when about '99, I think.
The 'good old days' of Skinz.org ... [and Deskmod, and Customize.org] ...