YUI is still used in Moodle, it may have stopped being supported by Yahoo, but it is still in the Moodle library.
That said, if you are using Moodle 2.9 then the default theme is called Clean theme which is in your theme selector page. whose Parent theme is Bootstrapbase which IS a Bootstrap 2.1.2 theme I, (or is 2.1.3? I forget).
So to answer your question, both AARDVARK and SHOELACE should work providing you havn't removed Bootstrapbase theme.
Hope that helps