One helpful tool used in CBT is recording your feelings. This is often times done through a recording form or journal entry. However, with younger children they often do not like to write so feelings charts are great because they can either circle or draw their feelings. The types of recording forms are numerous but here are the ones I have used.
If you have not been to this site, they have TONS of great behavioral tracking charts and tracking sheets: http://www.freeprintablebehaviorcharts.com
One of my favorite feelings faces chart is http://www.freeprintablebehaviorcharts.com/feeling%20chart%20pdf/feeling%20chart%20worried%202.pdf
as well as an Arthur emotions/feelings chart here: http://www.freeprintablebehaviorcharts.com/feeling%20chart%20pdf/Arthur%20Feelings%20Chart.pdf
If you would like to see more information on mood tracking sheets that also include thought tracking and are geared towards older kids see my post Mind over Mood, Depression, and Anxiety Worksheets.