This decoset by Decopac features a large Thomas the Train, two rings (one green and one red), and a carnival backdrop.  This set is wonderful for your train loving little one or for nostalgia on your cakes and confections.  
Decoset 30179 Carnival Thomas Friends
Four pieces and approximate dimensions
Thomas the Train: 3.75" L x 1.5"w x 2" t
Rings: 1.5" w x 1.5" t
Carnival Background: 5.5" w x 3" t