The measurements I used for the triangle was 2 1/2 x 3 1/2 but i trimmed it a tiny bit just cuz i liked them a little skinnier but 2 1/2 x 3 1/2 will work just fine!! Link to the blog I found inspiration from: ...
by Sonysree Creations
by KidToyTesters
by naztazia
by FastGear
by Osaka Crafts
by Lucky Apple
by Artkala