Windham Fabrics Prism - Downloadable PDF

Prism Quilt Pattern by Natalie Crabtree for Windham Fabrics – Free Downloadable PDF

The Prism pattern, designed by Natalie Crabtree and published by Windham Fabrics, is a free downloadable PDF quilt pattern that produces a stunning finished quilt top measuring 61¾" x 70". Rated as intermediate in difficulty, this pattern is an excellent choice for quilters who are comfortable with precise cutting and sequential piecing and are ready to take on a more structured, visually dynamic project. The pattern features the Uncorked by Another Point of View fabric collection from Windham Fabrics, giving the finished quilt its characteristic prismatic, jewel-toned or richly coordinated appearance.

What Is Being Made

The Prism project is a quilted blanket or throw, falling squarely into the blankets and throws category. At just under 62" wide and 70" tall, the finished quilt top is a generous lap or throw size, suitable for display or everyday use. The design takes its name from the way fabrics are arranged to create a light-refracting, geometric visual effect across the quilt surface.

Pattern Structure and Design Overview

One of the most distinctive structural features of the Prism quilt is its assembly method. Rather than being built from individual blocks arranged in a traditional grid, the quilt is constructed using 28 vertical rows. This row-based architecture is central to achieving the prism-like gradient or color-shift effect that defines the design. Each vertical row may contain uniquely sized or positioned pieces, which is why the pattern places strong emphasis on careful organization before piecing begins.

The pattern instructs quilters to mark and store cut pieces according to their assigned row before any sewing begins. This level of pre-organization is characteristic of intermediate-to-advanced quilting projects where fabric placement is critical to the final visual outcome. Quilters are also directed to read the entire pattern before starting and to check windhamfabrics.com for any pattern updates prior to cutting into their fabric.

Techniques Used

• Precision rotary cutting: The pattern relies heavily on accurate cutting of multiple fabric pieces in varying dimensions. Strips are cut at specific widths — for example, 7½" x WOF (width of fabric) strips — and then subcutted into individual pieces such as 3¾" x 7½", 4" x 7½", and 3½" x 7½" rectangles, each assigned to specific rows.
• Strip cutting and subcutting: A standard quilting technique where long strips are cut across the width of fabric and then crosscut into smaller units. This method maximizes efficiency and accuracy when working with multiple fabrics.
• Vertical row assembly: Rather than assembling blocks and then joining them, the quilt is pieced in 28 individual vertical rows that are subsequently joined together. This technique requires careful pressing and alignment to keep rows straight and the overall quilt square.
• Sequential and labeled piecing: The pattern assigns cut pieces to specific rows using a labeling system (Fabrics A, B, I, J, and others are cut and labeled individually by row). This organizational technique is essential for maintaining the integrity of the prism color arrangement.
• Quilt top construction: The pattern covers the assembly of the quilt top. Standard quilting practice would then involve layering the top with batting and backing, basting, and quilting by hand or machine, though finishing steps may be addressed within the full pattern.

Stitches and Sewing Methods

• Straight stitch piecing: As with virtually all patchwork quilting, the Prism pattern is assembled using straight-stitch seams on a sewing machine. Consistent seam allowances — typically ¼" in quilting — are essential for ensuring that rows and pieces align correctly across the 28-row structure.
• Pressing seams: While not always categorized as a "stitch," careful pressing of seams is a core technique in quilting that affects how rows nest together and how the finished quilt lies flat. Intermediate-level patterns like this one typically require deliberate pressing direction choices to reduce bulk at intersections.

Materials – Fabric

The Prism quilt pattern is designed to be made using quilting cotton, specifically featuring the