There aren't many applications using the solution as a whole - as it was just made public recenltly, but you can check some example applications used for tests in the lotus repo: https://github.com/lotus/lotus/tree/master/test/fixtures/

Here is a simple gist from Lotus author: https://gist.github.com/jodosha/9830002

And also there is a WIP room reservation app: https://github.com/sidonath/room-reservation

Just found another example app: https://github.com/joneslee85/lotus-blog