Buttons & Bow Quilt --

I started this quilt a couple of weeks ago. The quilt top went really quick, got that done in one evening. Its 72" x 81", I guess that's close to a twin size . The problem I'm having right now is finding buttons. Each quilt block get a 1-3/8" button sewn in the center with ribbon. I'm having trouble finding the buttons in that size in the colors of the quilt. If anyone has ideas where I can find plain, plastic buttons in rainbow colors, please let me know. I'm using a bright pink for the backing, I've got that prewashed and ready to stitch to get the width. I can lay out and pin but can't quilt until find the buttons. I'm thinking of using flannel instead of batting to give my quilt a lighter weight. I've done that before with table runners and worked well.  The pattern is from Fons & Porter Love of Quilting Nov/Dec 2006. I'm planning on giving this to my granddaughter - it'll be awhile before she'll use it.  She's only 8 month old and still in a crib. I know I'll have to make a version in primary colors next for my grandson. It's so hard having grandbabies. LOL.

Here's the picture from the magazine to show you what I mean about the buttons & bows. The pattern uses  chenille but I made mine from calico so it wouldn't be as heavy (and to use up some of my stash.)