Not much has changed in the style system from within 7.5.2 and onward; so anything created for that series should be able to work with little issue (such as my
UBB.threads v7 Styles).
There are several styles at UBBDev (
here) and
here at
UBBCentral as well.
If you encounter a theme that has missing elements, you can enter the Style Editor for that theme and there will be a "Copy From" link to associate missing entries to entries that would generally be "close enough" to provide a base.