So I use albumart in the playlist, I do the thing where you put the album cover in the image of a cd case and I've seen many others do this too. Well, when you have albumart that is not a 1:1 aspect ratio you end up with half an empty cd sticking out which is kind of ugly so I whipped up a bit of code to fill in the space with white but only when the albumart is present. This way you still see the empty cd case when no art is available.
// Album Art
$if($get(album_mode),$ifgreater($mul(%_height%,%_itemcount%),95,
$imageabs2(110,95,,$sub($mul(%_height%,%_itemindex%),$add(%_height%,3)),,%_height%,2,,images\emptycd.png,)
$if($fileexists($replace(%path%,%filename_ext%,$if2(%cdid%,[%artist% - ]$replace(%album%,?,,:,)).*)),
$drawrect(17,$sub(5,$mul(%_height%,$sub(%_itemindex%,1))),84,84,brushcolor-255-255-255 pencolor-null)
$imageabs2(84,84,,$sub($mul(%_height%,%_itemindex%),$add(%_height%,5)),,%_height%,17,,$replace(%path%,%filename_ext%,$if2(%cdid%,[%artist% - ]$replace(%album%,?,,:,)).*),)
,)
,),)
* this is for art in the itemlist not the group headers.