Try making a scrappy sampler quilt
I attached a picture of my most favorite quilt - a Lori Smith Sampler quilt called "Patchwork Sampler" (about 63" x 76"). Every block was different - different colors, different patterns, and assorted sizes. Unless you choose a uniform background fabric, you don't have to worry about having to buy yardages - except for your backing. My blocks were made with bits and pieces of civil war era reproduction fabrics. Lori also designs samplers that combine applique and piecing - and almost all of her patterns would look wonderful as "scrappy". Larger quilt patterns cost vary between $9 and $14 - shipping to USA is free - but only $4 to ship overseas. She also does patterns for small quilts. Her website is: Frommyhearttoyourhands.com
Her pattern directions are simple and accurate. Regardless of where you get the patterns - a scrappy sampler quilt would probably be the most cost effective. Good luck and keep us posted on your project. Happy quilting. Jan