Word order is fairly free in Finnish. However, people don't put words in just any order. Some collocations usually occur in poems and lyrics of songs only. Let's take an English sentence as an example:
Spring has come again. In Finnish the four words - there are four words in Finnish as well - can be in any order. Changing the word order never produces a question in Finnish. I think that only about six or seven of the possible combinations are actually normally used. No word order is ungrammatical, though, and therefore the words may occur in any order in a poem.
If I use the English word order, the sentence is: Kevät on tullut taas.
CB