In general, an alternative layout can be created in each module or component. The alternative layouts based on the Joomla! Template Output Override technique. From Joomla! 1.6 we have a very nice way to put several files such "Output Overrides". This fact makes it possible to create modules or components for several individual and totally independent variations.
In JYAML 4.x, e.g. for the various navigation elements (vlist, hlist and dropdown) are already included alternative layouts.
Override Style (modChrome)
[since JYAML 4.5.0]:
You can also override individually for each module at "JYAML: Module Layout Settings" the modChrome style.