Construct and align a repeating houndstooth unit within nail outlines

The short answer

A repeating houndstooth unit is one square tile divided into four quarters. One quarter is a solid dark square. One quarter is left as background. The other two quarters each hold the same pair of dark pieces, a diagonal strip and a small corner triangle, with the second pair rotated 180 degrees. Those diagonal pieces are what make houndstooth interlock instead of reading as a plain checkerboard. Build the tile on a grid, repeat it three-by-three outside the nail outline to confirm every edge connects, and only then scale and clip it to the nail shape.

It helps to keep three things separate. The motif is the geometry of the tile. The palette is the two colors you assign to the dark shapes and the background. The technique is how the pattern reaches the nail, whether painted over guides, stamped, or printed. This guide covers the motif and its placement. Palette and technique decisions sit on top of a tile that already repeats correctly.

Build the tile on a 10-by-10 grid

Mary Winkler's Illustrator tutorial gives a precise construction. It uses a 500 by 500 pixel canvas with nine grid dividers in each direction, which creates ten cells per side, each 50 pixels wide. The steps below follow that method in summary. Menu names and commands may differ in other software versions, but the geometry carries over to any drawing tool.

• 1. Upper-left quarter: draw a solid 250 by 250 pixel square that fills the quarter.
• 2. Lower-left quarter, diagonal strip: draw one closed shape. Start on the fourth vertical gridline from the left, run diagonally down to the third horizontal gridline from the bottom, continue to the bottom corner, run diagonally back up to the center of the grid, then close the shape with a horizontal line.
• 3. Lower-left quarter, triangle: add a right triangle in that quarter's lower-right corner, with legs spanning three cells horizontally and three cells vertically.
• 4. Upper-right quarter: duplicate the strip and the triangle, rotate the copies 180 degrees, and position them in the upper-right quarter.
• 5. Lower-right quarter: leave it empty so it becomes background.
• 6. Group all the dark shapes, add a 500 by 500 pixel background square aligned exactly to the canvas, and send it behind the group.
• 7. Hide the grid, then define the artwork as a pattern using Grid tiling and save it as a swatch.

Because the dark pieces and the background are separate objects, recoloring is a palette decision you can make later without touching the geometry. Swap the group color and the background color independently to test combinations.

Check the repeat connections before clipping

A tile can look right on its own and still break when repeated. Lay out a three-by-three block of tiles well outside any nail outline, then inspect every boundary where tiles meet, both horizontal and vertical. The center tile is the most useful one to examine because all four of its edges touch neighbors.

• Diagonal strips should continue across tile edges as unbroken slanted shapes, not stop at the seam.
• The solid square and the rotated strip-and-triangle pairs should meet to form the characteristic hooked, pointed check.
• If a junction looks like a plain square checkerboard, a stray notch, or a stair-step that ends abruptly, one of the diagonal pieces is misplaced or the 180-degree copy is offset.
• The background square must align exactly with the tile edge. Any gap or overlap shows up as a thin seam line once the pattern repeats.

Fix problems in the single tile, not in the repeated block, so the correction carries through every copy.

Choose scale and crop for the nail outline

Once the repeat is clean, the remaining decisions are how large the tile is relative to the nail and where the repeat starts. Record these choices so you can reproduce a layout across all ten nails or reuse it later.

Setting	What to record
Tile width	Final width of one complete tile on the planning drawing
Tile height	Keep equal to width so the tile stays square
Orientation	Whether the tile sits upright or is rotated on the nail
Scale	The factor applied to the original 500-unit tile
Horizontal offset	How far the repeat is shifted left or right before clipping
Vertical offset	How far the repeat is shifted up or down before clipping

Illustrative example, using hypothetical drawing units: scale the 500-unit tile down to 4 units wide, a factor of 4 divided by 500, or 0.008. A planning outline 12 units wide then holds exactly three tile widths. Compare a horizontal offset of 0 against an offset of 2 units, which is half a tile, while keeping the tile square. The two offsets change which part of the motif lands at the nail's center and edges.

For each scale, compare two crops. In the first, a complete motif sits in the middle of the nail. In the second, a junction between tiles sits at the center. A centered complete motif tends to read as a deliberate single check, while a centered junction emphasizes the interlocking diagonals. Neither is correct by rule. Choose based on whether you want the nail to read as one bold shape or as a continuous fabric-like field. Smaller scales show more repeats and read more like textile, and larger scales let fewer, bolder hooks dominate the nail.

Draw your own planning diagrams for these comparisons and keep the construction reference separate, so a crop change never alters the master tile.

Carrying the unit onto a hand-painted nail

The same square-first logic applies when painting freehand. TeddyKana's nail demonstration starts with horizontal and vertical guides that form a grid of squares on the nail, then modifies those squares into houndstooth shapes. A tile you have already checked in a three-by-three repeat gives you a clear map for those modifications. Mark the grid at your chosen scale and offset, then add the diagonal strip and triangle to the same quarters on every square.