I've used other percussion aids, too.
Wedge a shaker egg between the hair and wrapping of a German bow then play with rhythmic intensity. Good for Khlezmer and Middle Eastern music.
Hold the shaker egg in your hand and pizz. Lot's of possibilities with this.
Put a bit of rubber on a small egg shaker maraca and strike the strings with it like playing a tympani. Good for Latin music.
McGyver a small tambourine to your foot to play on beats 2 and 4. Good for Broadway, Pop, Gospel, etc.