I had that same problem and put blocks in to fill the spaces.[ATTACH=CONFIG]620719[/ATTACH]

An excellent idea and I'd go one further, print pictures of the t-shirts and arrange those first! Much easier than moving the shirts around??

If these are true sizes, it looks like your blocks will need to be 17 x 17. . I would either take a few out (perhaps make a couple pillows) or consider using a few in the backing. It doesn't appear any are small enough to combine, so you just need to make them all bigger to fit the 17 x 17. You can either frame the smaller ones and place them randomly around the quilt - - make them bigger and then use a sashing for all to tie it all together. You can use as small as 1" sashing so it doesn't add too much more to size. I would then frame it out with a 2" frame matching the sashing color. The only other thing I would consider is, if the shirts tend to all be the same color, but the logos are of various colors, consider adding cornerstones to the sashing of all the colors to brighten it up without detracting from the prints. I use the thinnest of battings or even flannel as batting because of the extra weight of the t-shirts and interfacing. Also, I quilt down the sashings and usually just do some sort of echo stitching around the logos. This secures them and highlights the logo. I think the most important thing with a t-shirt quilt is to think of it in stages. Do not think about the whole thing at once, it can be overwhelming. Think about fusing and cutting the shirts, arranging the layout, framing the blocks, assembling the rows, etc. At each stage, pat yourself on the back and think of what you have done. This sense of accomplishment goes a long way to keeping us going on a huge project! Please post pics when you are done, we would love to see it!!