In general, writing is the most complicated part of a language, therefore I try to find activities that are not too difficult, but still interesting for children to do them.
Recently I used post-its to create a writing activity in the 6th of primary, where students had to give information on the city they live in (Barcelona). We than created an "info wall" where students could write whatever they know about Barcelona on a post-it and hang it on the letters of Barcelona (they were drawn in big format).
This year I want to try the same activity online. There is an online tool called linoit that allows to create an online wall with post-its. I think this could be an excellent writing activity to do as homework.