I don't know if I can explain this right - but I saw some home decorating show where they did the kewlest things -
one was a baseball bat headboard (basically sawed the bats in half, then drilled them to a headboard frame) very cute - dh could do it - not me -
another thing was painting a HUGE baseball on the wall -
I bet you could put a tack in the center (not necessarially centered on the wall though) tie a string to it tieing a pencil to the other end and use that to make your circle - then paint it white - add stitching with red sharpies and voila!
you could add your childs name by writing in a way that looks like the baseball stitching too!
hth
have fun
post pictures when your done would love to see it!