The generator can fetch several sample template themes from this repository, in addition to the bundled "default" one, to help you create a nice-looking paginator.
rails g kaminari:views default
You can also specify between erb, haml or slim (in some themes):
rails g kaminari:views semantic_ui -e haml
To see the full list of available themes, take a look at the themes repository, or just hit the generator without specifying a THEME argument.
rails g kaminari:views