x.rb

roster = Roster.new
data   = PeopleService.fetch(some_search_params)

data.each do |person|
  if roster.names.count < 10
    roster.names << person.name
  else
    raise "You can't have a roster with more than 10 people on it"
  end
end

roster.style = :colorized

RosterPrintout.new(roster).generate_pdf("out.pdf")