The ornamental design for a tilemosaic, as shown and described.
FIG. 1 is a front view of a first embodiment showing my new design.
FIG. 2 is right-side view of my new design shown in FIG. 1.
FIG. 3 is left-side view of my new design shown in FIG. 1.
FIG. 4 is top view of my new design shown in FIG. 1.
FIG. 5 is a bottom view of my new design shown in FIG. 1.
FIG. 6 is a front view of a second embodiment showing my new design.
FIG. 7 is right-side view of my new design shown in FIG. 6.
FIG. 8 is left-side view of my new design shown in FIG. 6.
FIG. 9 is top view of my new design shown in FIG. 6; and,
FIG. 10 is a bottom view of my new design shown in FIG. 6.
The broken lines showing the diagonal webbing connecting the individual tiles and the non-front surfaces of the tiles are for environmental purposes only and form no part of the claimed design.