It's important to know at a glance which dragon is going to spawn next. Right now, if you follow your intuition, you'll be wrong about which dragon will spawn. The air emblem is the worst offender, looking like water even after I look at it closely. You can figure the other 3 out, but at a glance they all look like earth because of the spiral, plus muted natural colors.

Current emblems look like this:

https://4.bp.blogspot.com/-JY0PM6v23Hs/VyLohVTfYXI/AAAAAAAAOVI/oiXmC0iU6ucxyf25gCM2hjOGymlSezp9QCLcB/s640/4rune.jpg

For reference, the dragons look like this

https://4.bp.blogspot.com/--MxYUj6CJiY/Vxbk214uSiI/AAAAAAAA6AE/K1xZwuJboRYbuGDwbcwsahiRFWAd59NHQCLcB/s640/%255EFFDDA78945E1D6C0F99381C91E7B75158CA848C6DD883E16BC%255Epimgpsh_fullsize_distr.jpg

Emblems should look like this:

http://i.imgur.com/kxD10lO.png

I made the water emblem blue instead of green so it's easier for colorblind folks to tell apart from the fire emblem. I'd rather see them change the dragon to be more blue than keep the icon green.

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Edit2: I played around with this in grayscale, which is the best I know how to simulate being colorblind. Here's what that looks like for the current emblems. I found it pretty interesting how the "random blotches" actually play a big role in telling them apart, by changing how bright they appear.

http://i.imgur.com/ROjkpgc.png

The above emblems are easier to tell apart in grayscale than mine, except for air (although part of this is just because of loss of clarity as I have put them through filters). Here's another edit, changing the color/lumosity a little bit to help, including a revert back to Riot's earth emblem. If I were willing to do a bit more work to make it look good, I'd make the water a little brighter, but if I take the shortcut it'll look bad.

http://i.imgur.com/fHMeJCB.png

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Edit1: it never fails to amaze me how much more people vote in polls than vote on the thread. And I didn't even include a joke option..

Edit3: I'm talking about, 500 poll votes compared to 175 thread votes. This isn't a complaint about people not upvoting -- I care about the visibility from votes but if my thread is on the front page already, who cares; it's just really interesting to me, that people will use a poll if I make it but not the poll that's built in to the system.