Adult bibs but not a bib.... They sometimes need to cover their clothes when eating but don't want the embarrassment of having a bib on... so something that looks like a fake shirt or tuxedo to bring a light hearted approach maybe.
Book markers as many of them read.
Shoulder shawls -- cover their shoulders but keep their hands free.
Some people have said an "I Spy" quilt is great as many people can "play" the quilt at once.