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Using a table saw or circular saw, cut a 45-degree bevel from the width of the plywood on one of the long sides.
Using drywall screws and a screwdriver, secure two right triangles of 3/4" plywood -- each 2' x 10" -- to two opposite sides of one 2' x 2' piece of 1/4" plywood. Secure the plywood rectangle between the heights of the triangles. The beveled edge of the rectangle must face up.
Using a plunge router and a 1/2" double-fluted router bit, drill about six 1" slots into the second 2' x 2' piece of 1/4" plywood. The slots should be about 1" apart.