I used to use Fresh is back, then after a few changes it was missing for a while and had to use the Strong Blue skin, got used to it and quite like it.
I can see this thread going one way... at this time there is only strong blue skin.
I would import the old ones but they are not compatible with the latest vb3 if you look at the strong blue skin its not exactly the same as the old one.... infact the strong blue skin is the ORIGINAL skin but with the top bit...
Everything below the new buttons is the original skin that comes with vbulletin (oh except my thread Icons that I coded myself )