Since Zyra's plants make it difficult to give her more skins, why not Chromas?
I know myself and a lot of other Zyra fans (just take a look at the /r/zyramains on reddit) tend not to really be... Very fond of Zyra's skins. Generally I just use SKT to have one on, but frankly? Her base skin has the best design to it. It's really, really pretty. Zyra is pretty difficult to make skins for not only because of particles on her abilities themselves, but also because of her seeds (which has two different colors depending on if it's a passive or activated seed) and because she can spawn two different kinds of plants.
However, with more and more chromas coming out, it seems like it could be something easily done for Zyra - it would allow people to have more options to use when they go into game, but it should also be fairly simple to make them in comparison to a new skin for her. While I would still love a new Zyra skin (Elderwood, River Spirit, Death Blossom, and Four Seasons being some of my favorite concepts), and I would probably buy it instantly, getting some chromas for her in the meantime would also be really, really nice.
I'm not really a master of photoshop or anything but I took MissMaddy's picture of multiple shots of Zyra after she did her retexture (which can be found here: http://missmaddytaylor.deviantart.com/art/Zyra-605013031) and I edited the hue/saturation to give some examples what some Zyra chromas could look like. Some of them have similar palettes, and some have higher saturation (which might be a little hard on the eyes). I put 12 different concepts in there, and using only hue/saturation I could only maybe them so variedm but hopefully some of them click!