You've got some old ones that are staples in any collection. Unfortunatley they aren't worth a lot, but still cool. The clays are common, probaby turn of the century up to the 30s or 40s. The blues glazed ones are benningtons. The spots are from where they touched other marbles while they were fired in the kiln. They are from the same time period, made in America and Germany. The blue and green swirl looks like an Alley from the St. Mary's factory, maybe 1950s. The blue cateye is probably 60s or 70s. The colored one is 70s or 80s. The solid colored marble would be a game marble. The transparent swirl could have been made by nearly any West Virginia marble company in the mid 1900s.