For example, a red background when entering the NES collection, and blue one when entering the Genesis collection. Seems rather easy but the wiki is down for me so I'm lost.
I'm using
<reloadableImage type="background" mode="layout" x="0" y="0" alpha="1" width="stretch" layer="16">
<onMenuEnter menuIndex="1">
<set duration=".01">
<animate type="alpha" to="1" algorithm="easeinquadratic"/>
</set>
</onMenuEnter>
<onMenuExit menuIndex="1">
<set duration=".01">
<animate type="alpha" to="1" algorithm="easeinquadratic"/>
</set>
</onMenuExit>
</reloadableImage>
for the main menu, but I'm not sure how to call it for the collection menus.