I claim the ornamental design for a furniture base, as shown and described.
FIG. 1 is a perspective view of a first embodiment furniture base, in accordance with the present invention;
FIG. 2 is a front plan view of the furniture base shown in FIG. 1;
FIG. 3 is a back plan view of the furniture base shown in FIG. 1;
FIG. 4 is a right side plan view of the furniture base shown in FIG. 1;
FIG. 5 is a left side plan view of the furniture base shown in FIG. 1;
FIG. 6 is a top plan view of the furniture base shown in FIG. 1; and,
FIG. 7 is a bottom plan view of the furniture base shown in FIG. 1.
The furniture attached to the furniture base in FIG. 1 is shown for environmental use purposes only, and forms no part of the claimed invention. The feet of the legs, the foot rest ring, and the furniture attachment plate of the furniture base are illustrated in broken line, and as such form no part of the claimed invention.