Just thought of another one .... can you find those things that moo and squeek???? .... I think they can be purchased at Michael's and the like. Would be fun to sew them in, and then he's got something to squeeze for sound effects! :)
And people! .... one for your this wee man, and perhaps others in his life, ie Mommy, Daddy, and of course, YOU!!! :)
One of the blocks could be done to represent his home? Or perhaps do it as a bigger block in the centre of the quilt?
Shapes of cars, trucks, and other vehicles and pieces of equipment?