While this is a good idea, I cannot imagine it working. The scene, color range and exposition would have to be different with both as they are quite opposite of each other, trying to put it together into single splash art would most porbably look forced and weird.
Like imagine Brand and Anivia splash combined. You may imagine some cool exposition like Brand standing beneath with the pose he has now with Anivia spreading her wings like she does now above him, however either:
- The champs in the exposition would have to be far away from each other making them look small*
- If they were close, the color range forced mash would be eyes-stabbing
- *Note that point of splash is to expose the champion so the scene is always just some background for the effect, atmosphere and color range. If two champions were together, there would be less or equal amount of focus on them and the scene, which is already bad, take into consideration that they would also be splitting the rest of the focus.
I found this image as best example of what I mean:
https://s-media-cache-ak0.pinimg.com/736x/a0/f2/a2/a0f2a299900567756cbe65dc29824ffc.jpg
This is actually very good fanart on its own, however, noticed the reason this wouldn't be good dual splash?
- Not enough focus on Leona compared to, for example, focus captured on these splashes
http://ddragon.leagueoflegends.com/cdn/img/champion/splash/Poppy_0.jpg
http://ddragon.leagueoflegends.com/cdn/img/champion/splash/Taric_0.jpg
http://media.wwg.com/2017/01/wallpaper-warwick-199584-200621.jpg
In case it was zoomed at Leona, it would be different story, however there wouldn't be space for Diana.
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While the bright-golden color makes it so that color ranges of these two are compatible, it is questionable how well glowing gold would fit to shadow purple.
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Diana is not visible fully.