Classic writing tools form the basis of keeping a journal. These exercises can be used over and over again.
Flow or Stream of Consciousness Writing
Just write. Put your pen on the page and keep it moving. Let the words flow from you. Don't edit, just write whatever comes, however it comes.
[This is a classic writing tool used for years by writers and poets. I learned it originally in writing classes at school. Some Modern day names include: Morning pages, writing practice, brain drain]
Variation: I like to also use this tool to write stream of conscious poetry.