This GeoGebra grid "paper" is useful for online explorations and the creation of accurate grid paper figures. If you're looking for printable PDF special papers, I share some here.
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Grid Paper Activities
Pythagorean theorem on grid paper
From Geometry Labs (free download)
Polyominoes: Labs 4.1-4.7
Supertangrams: Lab 4.9
Tiling: Lab 7.1
Perimeter and Area: Labs 8.1-8.3
Similarity and Scaling: Labs 10.3-10.4
(a whole book of math enrichment — free downlad)
Tiling Rectangles with Pentominoes
Minimum Polyomino Cover
Inscribing Squares in Polyominoes