I'm always looking for artifacts for my students portfolios. I try to find items that will be keepsakes for my students and their parents but also show their development throughout the year.
I make a self-portrait page for the fall and one for the spring and place them next to each other in the child's portfolio. This also allows me to collect data (number of body parts drawn) for report cards.
You can download the template FOR FREE here. The background is white but can be printed on colored paper or cut out and pasted on colored paper.