The ornamental design for a holder for small objects, as shown and described.
FIG. 1 is a perspective view, according to the present invention;
FIG. 2 is one side view, according to the present invention;
FIG. 3 is another side view, according to the present invention;
FIG. 4 is another side view, according to the present invention;
FIG. 5 is another side view, according to the present invention;
FIG. 6 is another side view, according to the present invention;
FIG. 7 is another side view, according to the present invention; and,
FIG. 8 is another perspective view illustrating the holding of a small object, according to the present invention.
The broken line showing of a holder for small objects is included for the purpose of illustrating elective and non-ornamental elements and forms no part of the claimed design.