Riley Blake Triangle-In-A-Square Quilt 2 - Downloadable PDF

Riley Blake Triangle-In-A-Square Quilt 2 by Gerri Robinson – Free Downloadable PDF Pattern Summary

About This Quilt Pattern

This free downloadable PDF pattern, designed by Gerri Robinson of Planted Seed Designs, guides quilters through the construction of a vibrant, geometric quilt measuring a finished 60" x 76". The design is part of the Triangle-in-a-Square series and showcases the bold, colorful Gem Stones Bright Collection for Riley Blake Designs. The pattern is ideal for quilters who enjoy working with specialty rulers and want to create striking, modern geometric designs with a dynamic interplay of color and shape.

What Is Being Made

The finished project is a full-size quilt measuring 60 inches wide by 76 inches tall, constructed from 168 Triangle-in-a-Square (TIAS) units arranged into 13 vertical rows. The design creates a visually bold, repeating geometric pattern using colorful center triangles set against a crisp, neutral background fabric. The overall effect is a lively, jewel-toned quilt with a structured yet energetic layout.

Techniques Used

• Triangle-in-a-Square (TIAS) block construction – the core technique of this pattern, in which a center triangle is framed by two matching side triangles to create a precise, square-finished unit
• Specialty ruler work – the pattern specifically requires the Planted Seed Designs' Triangle-in-a-Square Tool, a dedicated quilting ruler that ensures accurate cutting and assembly of the triangular units
• Strip cutting – fabric is cut into 4-1/2" width-of-fabric (WOF) strips before being sub-cut into center triangles, side triangle pairs, squares, and rectangles
• Vertical row assembly – completed TIAS units, squares, and rectangles are pieced into 13 vertical rows, which are then sewn together to form the full quilt top
• Binding application – the quilt is finished with a traditional straight-cut binding using 2-1/2" WOF strips

Stitches and Sewing Methods

• Straight stitch piecing – all block and row construction is completed using standard straight-stitch machine sewing, as is typical in patchwork quilting
• Precise seam allowances – accurate quarter-inch seams are essential when working with triangular units to ensure points meet cleanly and blocks finish to the correct size
• Row-by-row assembly – rows are individually pieced and then joined in sequence, a method that helps manage alignment across a large quilt top

Materials and Fabrics

The pattern calls for a carefully curated selection of Riley Blake Designs quilting cottons, with the full fabric list as follows:

• Background fabric: Riley Blake Confetti Cotton (C120-Cloud) – 3-7/8 yards, used for all side triangle pairs, background squares, and rectangles
• Gem Stones Cherry Bomb (Print #1): 1/2 yard, providing 43 center triangles as the dominant accent color
• Gem Stones Lagoon Blue (Print #8): 3/8 yard, yielding 25 center triangles
• 14 assorted Gem Stones prints: 1/4 yard each, each contributing 7 center triangles (with Sonic Green Print #27 providing 3 additional triangles for a total of 10 from that colorway)
• Binding fabric: 5/8 yard, cut into eight 2-1/2" WOF strips
• Backing fabric: 4-3/4 yards

Tools Required