I have made several twister quilts of different sizes and I sure am with the call the shop owner and see if you can get more fabric...I think it would be very hard if not impossible to cut with blocks smaller than the specified size....now, if you happened to have a smaller twister ruler....you could follow the instructions for that size and it would be doable and you would end up with a smaller quilt....I think there were 5-6 different sized twister rulers if I recall....umm...the biggest one....really needed a huge space for your piece prior to cutting it down....the smallest one I did was not the smallest size....but it was putzy...they are fun to make...I made quilts and several table toppers out of the twister rulers...umm...may have to make more!