i would suggest a 'custom' frame system... frame each block separately with either a matching fabric or different for each block to complement each block's colors... use a generous 2.5 or 3 inches... then after assembling... measure all to find the smallest block (they will be different because of each star's original size before framing. After you find the smallest one, trim all other to the same size, squaring up as you go... now they will all fit together perfectly and no one will be able to see the tiny difference from block to block... This is a method i often use when i find antique or stacks of unfinished blocks... you can make everything the same size without sacrificing any of the first round of work whether it's yours or someone elses'...good luck