Hi Joe,
in reply to your question about the 10 minute block, have a look at these links:
http://www.quiltingboard.com/picture...t-t190107.html
http://www.quiltingboard.com/picture...k-t190252.html
http://www.quiltingboard.com/tutoria...k-t118199.html
Would you consider table runners? Here's an idea:
http://www.quiltingboard.com/picture...r-t188325.html
or even pot holders?
http://www.quiltingboard.com/tutoria...t-t175916.html
My lap quilts are usually square shaped between 36" x 36" to 44" x44". I have made one that is 56" x 56". I think you need to decide what size and shape you think would be most saleable and take it from there.
Hope this helps. Would be interested to know how you get on. Best wishes.