The design consists of the features of shape, ornament, pattern and configuration of the SHELL & SLIDE PACKAGING WITH ORNAMENTS shown in the attached drawing(s) whereinFIGURE 1 is a perspective front view, showing front left side and top of an open pack of a first variant of the design thereof;FIGURE 2 is a perspective front view, showing front, left side and top thereof;FIGURE 3 is a perspective rear view; showing rear, right side and bottom thereof;FIGURE 4 is a non-perspective/elevational front view thereof;FIGURE 5 is a non-perspective/elevational rear view thereof;FIGURE 6 is a non-perspective/elevational left side view thereof;FIGURE 7 is a non-perspective/elevational rear side view thereof;FIGURE 8 is a non-perspective/elevational top view, the bottom view being a mirror image thereof;FIGURE 9 is a perspective rear view, showing rear, right side and bottom of an open pack;FIGURE 10 is a perspective front view, showing front left side and top of an open pack of a second variant of the design thereof;FIGURE 11 is a perspective front view, showing front, left side and top thereof;FIGURE 12 is a perspective rear view; showing rear, right side and bottom thereof;FIGURE 13 is a non-perspective/elevational front view thereof;FIGURE 14 is a non-perspective/elevational rear view thereof;FIGURE 15 is a non-perspective/elevational left side view thereof;FIGURE 16 is a non-perspective/elevational rear side view thereof;FIGURE 17 is a non-perspective/elevational top view, the bottom view being a mirror image thereof;FIGURE 18 is a perspective rear view, showing rear, right side and bottom of an open pack;FIGURE 19 is a perspective front view, showing front left side and top of an open pack of a third variant of the design thereof;FIGURE 20 is a perspective front view, showing front, left side and top thereof;FIGURE 21 is a perspective rear view; showing rear, right side and bottom thereof;FIGURE 22 is a non-perspective/elevational front view thereof;FIGURE 23 is a non-perspective/elevational rear view thereof;FIGURE 24 is a non-perspective/elevational left side view thereof;FIGURE 25 is a non-perspective/elevational rear side view thereof;FIGURE 26 is a non-perspective/elevational top view, the bottom view being a mirror image thereof;FIGURE 27 is a perspective rear view, showing rear, right side and bottom of an open pack;FIGURE 28 is a perspective front view, showing front left side and top of an open pack of a fourth variant of the design thereof;FIGURE 29 is a perspective front view, showing front, left side and top thereof;FIGURE 30 is a perspective rear view; showing rear, right side and bottom thereof;FIGURE 31 is a non-perspective/elevational front view thereof;FIGURE 32 is a non-perspective/elevational rear view thereof;FIGURE 33 is a non-perspective/elevational left side view thereof;FIGURE 34 is a non-perspective/elevational rear side view thereof;FIGURE 35 is a non-perspective/elevational top view, the bottom view being a mirror image thereof;FIGURE 36 is a perspective rear view, showing rear, right side and bottom of an open pack thereof;FIGURE 37 is a perspective front view, showing front left side and top of an open pack of a fifth variant of the design thereof;FIGURE 38 is a perspective front view, showing front, left side and top thereof;FIGURE 39 is a perspective rear view; showing rear, right side and bottom;FIGURE 40 is a non-perspective/elevational front view thereof;FIGURE 41 is a non-perspective/elevational rear view thereof;FIGURE 42 is a non-perspective/elevational left side view thereof;FIGURE 43 is a non-perspective/elevational rear side view thereof;FIGURE 44 is a non-perspective/elevational top view, the bottom view being a mirror image thereof; andFIGURE 45 is a perspective rear view, showing rear, right side and bottom of an open pack.