I claim the ornamental design for an illuminated placemat and coaster set, as shown and described.
FIG. 1 is a front view of the illuminated placemat and coaster set.
FIG. 2 is a back view of the claimed design.
FIG. 3 is a side view of the claimed design.
FIG. 4 is a top view of the claimed design; and,
FIG. 5 is a perspective view of the claimed design.
The broken lines appearing on FIG. 1 and FIG. 5 of a flag and the words, are environmental matter forming no part of the claimed design. The broken lines appearing on FIG. 2 are for the purpose of illustrating portions of the Illuminated placemat and coaster, which form no part of the claimed design.