This conundrum is the main reason I make these things from my stash, which I've endeavored over 30 years to build up with lots of neutrals/background and blenders.
It truly helps to have a stash like this because I never have to run out in the snow/rain/heat to buy fabric or hit internet shops when the budget is limited that month. Can't even tell you how many quilts I've made completely from stash, excepting maybe the backing. I rarely buy more than a yard of any one fabric and often just 1/2 to 3/4 yard. Though I don't have massive yardage of fabric in my collection, I do have
hundreds of different fabrics!
I hope you are able to solve your problem and find you enjoy having leftover fabric - on purpose - from this challenge.
Jan in VA