Well, I've designed my own before, 2 t-shirt quilts I made from my grand daughters. I am not into (although starting to learn!) the small squares etc, but I just cut the front of the t's 9" sq and appliqued them onto a 12" block and then just made sashing 4" between all blocks. A pic is in my profile. THe other one I am ready to do the binding on is same...just in purples.

Another one I have the top done, just have to start the layering...I found a picture with pattern/instrucitons on a site... and although I didnt' like the finished quilt (just way to busy!) I did like the block design. So I made 12, 8" blocks, and then made the sashings of 5" and alternated the 3 different fabrics/patterns in 1" strips so sashing were 5x8. I will do a picture, but it sure did turn out really nice..especially for my first attempt at such a thing. I find it hard to follow a pattern exactly. don't know why. But I just take the gasics and then embellish and change as I want to.

Another tip.. do as you ahve done...toss in them questions to the rest of us and get some feedback. Good luck