Here are links to several posts with pictures from another blog I write that isn't all about math.
Regular tilings of the plane. (The stuff we talked about this Tuesday and we will continue to discuss it on Thursday before the Spring break.)
Platonic solids. (Kind of the same idea, but in three dimensions.)
Truncated platonic solids. (Things like soccer balls and geodesic domes.)
Penrose tiles. (Sir Roger Penrose made two non-regular quadrilaterals that can tile the plane, but not following the same pattern at every corner.)