Yes it is possible to find themes based o different categories like flowers, cool, dark, animated etc..Just follow these steps:
1- Open kika keyboard app in your smartphone and at the home page look at the top bar. There you can see it is written "themes"..as shown in below image..
2- Now after opening themes tab you can see a lot of themes there. If you want to get theme according to some specified category then see the row of mentioned categories...
Choosing any one category you can then select any theme and download in your smartphone.
