gift for a ring bearer

i have a 9 year old ring bearer whom im struggling to come up with gifts for.

so far i bought him a cheap little kids watch (groomsmen are getting pocket watches);

i bought his sister a purple kids watch as well - but would really like to get her a pearl necklace or bracelet since the bridesmaids are getting pearl jewelry sets.

if i get her the second item - what should i get him??? its not like hes going to wear jewelry...

any ideas??