Building block toy

FIG. 1 is a front elevational view of a building block toy showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines represent boundaries of the claimed design. The areas bound in broken lines and shown in half-tone de-emphasized shading illustrates portions of the building block toy that form no part of the claimed design. Neither the broken lines themselves nor the lightened areas contained within the broken lines form any part of the claimed design.