A few excerpts from "Survey of Sanskrit Literature" by C. Kunhan Raja Bharatiya Vidya Bhavan, 1962 . pp 153 ...
Similarly in a Grand Epic also there is introduced some exhibition of skill in handling the language. They are usually found in the middle of the epic.

I have already referred to some type of alliteration called the Yamaka, where three or more syllables are repeated.
Various other devices are resorted to in poetry by poets to bring about the right setting for the presentation of the poetic art; they are not integral parts of the poetry, they are only border decorations. ...

The letters forming the verse are sometimes capable of being arranged in some figures, like the figure of a chariot or a WHEEL or a LOTUS. Sometimes there is only one letter in the whole verse ...

pp 340, 341 .The device of constructing verses which can be written out in the form of a LOTUS or of a CHARIOT has already been noted in the main book. This has developed into different forms. In that connection the device of writing verses with only a single letter, or only two letters, the device of writing verses in such a way that it can be read backward also, or can have two meanings by the splitting up of the words in different ways has also been noticed.

Ramakrsnavilomakavya has the first half repeated backwards in the second half and the poem narrates the story of Rama and Krsna at the same time. There are others where even five stories are narrated together in the same set of verses.

Another device is to take the first letter of the lines in the Ramayana and write the verses with that letter in the beginning.