The Skins Back to School (J.Parkin), Nixitubewood (Eric) and
Oldschool (Tim Brand) are Home Clock Skins. You can't find them on
Skin Market but still can download them and apply them.
To do that, go to the Beautiful Widgets Settings >> Home
Settings >> Clock Skins. Swipe to Stand Skins and browse the
list (you can sort the list by Skin name or author), download and
apply. And don't forget to Save&Apply when using Home