I actually have a project with a blood stain on it.
When I was in college I took a design class where the class designed a project and then manufactured and sold it. During the manufacturing process I managed to cut my finger while using the table saw and bled on a couple of pieces. While I was at the doctor getting fixed up the guys in class figured it would be funny to finish the box with the stained pieces and gave it to me at the end of class.
as a side note, my parents responses to my injury have become priceless lines in my family.
I called up my dad and said "hey dad, I cut my finger in the shop". dad says "as bad as grandpa" I said "nope". dad says "How could you be so stupid."
I called up my mom and said "hey mom, I cut my finger in the shop". Mom says "I bet you wish you had that math minor now".