Surface Ornamentation for a Smokeless Fireplace Fuel Cartridge

FIG. 1 is a front perspective view of a surface ornamentation for a smokeless fireplace fuel cartridge, showing the new design; FIG. 2 is a bottom perspective view thereof; FIG. 3 is a front elevation view thereof; FIG. 4 is a rear elevation view thereof; FIG. 5 is a top plan view thereof; and, FIG. 6 is a bottom plan view thereof. Any shading and cross-hatching are not features of the design but are utilized to illustrate the surface contours of the device in the drawings. It will be understood that the dashed lines presented in the drawings are for illustration only, and do not form a part of the claimed design.