Diane,
Maybe you could take a photo of the 10 yr, old with some of his Boston Bruin momentos and use that as a center of the quilt. Then use their colors for other blocks, or just use his picture and their colors, he may not like them forever. You know kids change their minds about sports teams, almost as often as they change birthdays. But then he may be like my son, he has had a special and favorite team, since he was in kinder, and he is 34 now, so some never change. Sounds like you made a big hit with the youngest, glad you did his first!! Must have really made him feel important and good not to have to be the last one to get a quilt. The 10 yr. old is old enough to understand and be able to wait a while.