Ethereal card BG

[gskleres]

Is there any way to make it so that Ethereal Seeker cards have a different BG than regular cards? For example, if we created a second purple card frame that looked all glittery, could we use that as the card background instead of the regular one for Ethereal cards? And more importantly, when a regular card gains the ethereal attribute, can we swap out the background from regular purple to the aforementioned glittery purple?