First, let every student make a fingerprint onto white paper. Next, blow up their fingerprints using the photocopier (8×10 or larger). Then, Have your kids write words and phrases about themselves along the lines and whorls of their fingerprints, and sign. Could be an introduction to writing an autobiography?
Fingerprint "Self-Portrait": Start by enlarging fingerprints then using a sharpie to "darken" or "thicken" the lines of the print. Description from pinterest.com. I searched for this on bing.com/images