Paint Scraper Glockenspeil (Listen)
The paint scraper glockenspeil was one of my first successful home brewed instruments. Simple to execute and all came from finding that a paint scraper (cheaper the better - thinner metal) has a wonderfully resonant tone. The second one from the left has a much richer tone than the rest. The tuning is relative from low to high.
I have since find out that a very similar instrument (the shovellaphone) is documented in New and Rediscovered Musical Instruments.