The ornamental design for a ceilinggridcaddy, as shown and described.
FIG. 1 is a perspective view of a ceiling grid caddy showing my new design, with the side bar attachment shown in an alternate position and shown in a condition of use.
FIG. 2 is a front elevational view thereof.
FIG. 3 is a back elevational view thereof.
FIG. 4 is a right side elevational view thereof.
FIG. 5 is a left side elevational view thereof.
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines in FIG. 1 showing a scaffold are for the purpose of illustrating environment and form no part of the claimed design.