Good start! Ready for swapping time.
Found a new quilt idea for those leftover blocks - when you don't have enough for a full I Spy quilt.
They are called Happy Blocks.
http://www.maryquilts.com/happy-bloc...-heartstrings/
I would add, sort your I Spy blocks into 2 stacks - particularly if there are directional prints (have a distinct top: i.e. a person) and alternate where the long sides are - some across the top and some along the sides. That way there are no seams to match up on each block. Makes construction much easier.
Here is a twisted version -
http://www.maryquilts.com/wp-content...ocks-quilt.pdf